# Clark County Off-Site Improvement Bonds, Dust Permits and Drainage Rules

URL: https://mycontractorsinsurancequote.com/nevada/metros/las-vegas/clark-county
Updated: 2026-10-29 · Reviewed by the Principal, Gleason Insurance Brokers, LLC
Publisher: My Contractors Insurance Quote, a website of Gleason Insurance Brokers, LLC

In unincorporated Clark County, Title 30 section 30.04.08C.3 requires the developer to deliver a 100% performance bond or a cash deposit equal to the Director of Public Works' estimate before the subdivision map records or a building or grading permit issues. Subdivisions can get a one-time 80% reduction when only sidewalks, utility pads or boxes and slurry seal remain, and the last 20% is released when the work is completed and accepted. A Department of Environment and Sustainability dust permit and the Regional Flood Control District's drainage rules shape the same site plan, so the surety and liability program is typically built around all three.

## Key Decision Points
- Title 30, amended effective September 17, 2026, calls for a 100% performance bond or cash equal to the Public Works estimate.
- Security is due before map recording or before a building or grading permit issues.
- A one-time 80% reduction is possible for subdivisions when only listed minor items remain, and the final 20% releases at acceptance.
- A surety must be Nevada-licensed, listed in Treasury Circular 570 and rated A or better by A.M. Best with a Stable or Positive outlook.
- A dust permit is needed at 0.25 acre of soil disturbance or 100 feet of mechanized trenching.
- These rules cover unincorporated areas only; Las Vegas, Henderson and North Las Vegas set their own.

## Where County Rules Apply and Where They Stop

Clark County's own August 2025 place estimates put the county at 2,465,431 people, with 1,073,926 of them living in unincorporated areas. That is more residents than any single city in the county, and Enterprise alone counts 261,749. Much of the valley's new subdivision and industrial work therefore runs through the county's Department of Comprehensive Planning and Public Works rather than through a city hall.

The requirements on this page come from the county's Title 30 Unified Development Code and county department pages, and they govern unincorporated land only. The City of Las Vegas, Henderson and North Las Vegas each write their own improvement agreements, bond forms and acceptance steps. A developer with parcels on both sides of a city line should expect two sets of documents and should confirm which jurisdiction holds each map before the surety prices the bonds.

The valley-wide picture, including water commitments, is covered under [Las Vegas Valley dust, water and drainage rules](https://mycontractorsinsurancequote.com/nevada/metros/las-vegas).

## The Title 30 Performance Bond or Cash Deposit

Section 30.04.08C.3 of Title 30, in the code copy the county posts with its latest amendment effective September 17, 2026, sets the security for off-site improvements. The developer delivers either a 100% performance bond or a cash deposit in the aggregate amount the Director of Public Works estimates for the total cost of the improvements. The required improvements must be provided for before the subdivision map records, or before a building or grading permit issues, so the bond is typically on the critical path to the first permit.

The code also sets a standard for the surety itself. The company must be licensed in Nevada, listed in the U.S. Treasury's Circular 570 and hold a current A.M. Best rating of A or better with a Rating Outlook of Stable or Positive. A developer whose surety relationship sits with a smaller or lower-rated company may need to move the account before the first Clark County map.

Nevada law leaves the amount to the local governing body: NRS 278.380 lets a county require a good and sufficient bond or other security in the amount it determines. Clark County's answer is the full Public Works estimate, not a percentage of it.

How Nevada counties and cities size and release map security is covered under [Nevada subdivision improvement bonds](https://mycontractorsinsurancequote.com/construction-surety-bonds/subdivision-improvement-bonds/nevada).

### Illustrative scenario: A Southwest Valley Subdivision Outside the City Line

Desert Ridge Communities, a fictional developer, is mapping 140 lots on unincorporated land in the southwest valley. Public Works estimates the off-site streets, water, sewer and drainage at $6,200,000, and the drainage study adds a detention basin under the Regional Flood Control District manual. The developer's surety is not on Circular 570 with an A rating, so its broker moves the account to a Nevada-licensed, A-rated surety and posts a $6,200,000 performance bond before the grading permit. The grading contractor holds the dust permit for 38 acres and the utility subcontractor's 600 feet of trenching. Near the end, only sidewalks and slurry seal remain, and with the utilities' agreement the developer asks Public Works whether its bond qualifies for Title 30's one-time 80% reduction, since the 2024 Posting Bonds checklist limits partial releases to cash forms. Before signing subcontracts, the developer passes the one-year warranty and $1,000,000 liability terms in the county's off-site improvements agreement down to its site contractor. These details are hypothetical, and a real program depends on the county's current requirements, the surety or carriers and the firm's own risk.

## Cash in Lieu, the 80% Reduction and Final Release

A developer may post cash instead of a bond, but Title 30 caps a cash deposit at the amount insured by the FDIC or NCUA and keeps a 10% retention of the deposited funds at all times until every improvement has been completed and accepted. Cash ties up capital that a bond line would otherwise leave free for land and vertical work, so most developers weigh the bond premium and indemnity against the carrying cost of the deposit.

Release comes only with acceptance. For subdivision projects, the code allows a one-time bond reduction of 80% when the only remaining items are sidewalks, utility pads or boxes and slurry seal, with the utilities agreeing. The remaining 20% is released on completion of that work, and the improvements are accepted for maintenance at that point.

Time matters too. The code ties the security to completion within two years of the date the permit issues, or the time allowed in an approved Extension of Time. A project that stalls past that date can put the bond in front of the county and the surety, so phasing and extension requests are worth planning before the clock runs.

- Bond or cash: 100% of the Director of Public Works' estimate
- Cash: capped at the FDIC or NCUA insured amount, with 10% retained until acceptance
- Reduction: one time, 80%, subdivisions only, when listed minor items remain
- Final 20%: released on completion and acceptance for maintenance

Bond capacity, indemnity and the rest of a developer's program are covered under [Nevada developer insurance and bonds](https://mycontractorsinsurancequote.com/nevada/audiences/developers).

## Warranty, Insurance and Right-of-Way Terms Outside Title 30

Title 30 does not state a warranty or maintenance period or a warranty bond percentage in the sections that govern off-site security. Those terms sit in Clark County's off-site improvements agreement instead: the example agreement Public Works posts, dated 2013, sets a one-year warranty from the County's acceptance of the work, as explained below. The developer and its site contractor should settle who carries that post-acceptance obligation before subcontracts are signed, and confirm that the agreement the County issues for the project carries the same term.

The same goes for right-of-way work. Encroachment permits for utility cuts and driveway work in county streets come from Public Works, and the permit bond, its amount and any insurance limits should be confirmed with the department for the specific permit. The Public Works Bond Processing page lists the documents handled together: off-site improvements agreements, the performance bond or cash-in-lieu bond, bond estimate fees, a Certificate of Liability Insurance and W-9 forms, with originals required. For off-site improvement bonds, the Public Works Posting Bonds checklist sets that certificate at $1,000,000 in liability coverage naming Clark County as additional insured and certificate holder, so the county's own checklist, not another city's form, is the reference. Those off-site documents do not set terms for a right-of-way encroachment permit, which are still confirmed with Public Works for each permit.

How street-cut and right-of-way permit security typically works is covered under [Nevada encroachment and right-of-way permit bonds](https://mycontractorsinsurancequote.com/construction-surety-bonds/encroachment-permit-bonds/nevada).

## Dust Control Permits Tied to Grading

Title 30 ties grading permits to the off-site bond and to air quality. A Dust Control Permit from the Department of Environment and Sustainability is required when grading or soil disturbing activities exceed one quarter acre. The department's permitting page sets the operating permit thresholds at 0.25 acre or more of soil disturbance or construction, mechanized trenching of 100 feet or more and mechanical demolition of 1,000 square feet or more.

Those thresholds catch nearly every subdivision and many utility jobs. A trenching subcontractor laying a short service line can still cross the 100-foot mark, so the general contractor's subcontract should say who holds the permit and who answers for a dust notice of violation. Fines and remediation tied to a permit violation are a contract and compliance question first, and whether any policy responds depends on its terms and exclusions.

Pollution exposures from grading and soil work are covered under [site development pollution liability](https://mycontractorsinsurancequote.com/contractors-pollution-liability-insurance/site-development).

## Flood Control Drainage and the SNPLMA Urban Area

Title 30 requires drainage to comply with the Uniform Regulations for the Control of Drainage and the Hydrologic Criteria and Drainage Design Manual, with the governing materials on file with the Clark County Regional Flood Control District. Drainage conditions often add channels, inlets and detention to the off-site improvements, which raises the Public Works estimate and the bond with it.

The code also defines which road and improvement standards apply. Its Urban Area is the land within the outer boundary of the Las Vegas Valley Bureau of Land Management Disposal Boundary established by the Southern Nevada Public Lands Management Act, and land outside it falls under the nonurban standards. A parcel's side of that line can change the scope of required improvements and therefore the bond.

Federal land sales inside that boundary keep the pipeline moving. On September 10, 2026, the Bureau of Land Management announced the sale of nearly 940 acres to the City of Las Vegas for up to 6,000 homes, with 10% of proceeds going to the Southern Nevada Water Authority. That land sits in the City of Las Vegas, not unincorporated county, so its improvements follow city rules, but it shows how much valley site work is still ahead.

A neighboring city's own drainage study rules are covered under [North Las Vegas drainage and utility standards](https://mycontractorsinsurancequote.com/nevada/metros/las-vegas/north-las-vegas).

## Public Works Bond Options, Drainage Studies and the Flood District

Clark County Public Works' Drainage Study page says a drainage study is required when a site is impacted by a Special Flood Hazard Area mapped by FEMA, is next to or affected by a Regional Flood Control District Master Plan facility or takes flows from a wash or facility. Its Drainage Review Group reviews drainage studies and grading plans and coordinates with the Regional Flood Control District on floodplain issues. The Off-site Improvement Permits page adds that the drainage study must be approved before the off-site submittal and that a bond estimate is due with the first submittal, with a plan check minimum of $300.

For off-site improvements, the Public Works Posting Bonds checklist, last revised September 19, 2024, lists three ways to post security: a performance bond on the County's blue bond form from a surety listed in Treasury Circular 570, a cash-in-lieu-of-bond agreement with a Nevada bank capped at $250,000 or a cash bond by cashier's check. Bond amounts must match the approved bond estimate, and the checklist calls for a $1,000,000 liability certificate naming Clark County as additional insured and certificate holder. The County's certificate form names Clark County Public Works Development Review as holder and prints no limits. The checklist says partial releases are available only on the cash forms, while Title 30, in the copy amended effective September 17, 2026, describes a one-time 80% reduction for subdivisions, so confirm with Public Works which applies to a given bond.

The off-site improvements agreement sets the terms after acceptance. In the example agreement Public Works posts, dated September 2013 in its file name, the work carries a one-year warranty from the date the County accepts it, and defects must be corrected within 30 days of notice. The same example requires commercial general liability of at least $1,000,000 combined single limit per occurrence with the County as additional insured, coverage that is primary, a waiver of subrogation and 30 days' notice, along with a broad defense and indemnity obligation that reaches the developer's contractors and subcontractors. If the County draws on the security, it must be replenished within 30 days, and the County may draw after 60 days of suspended work. The County's example Performance and Guaranty Bond, also from 2013, stays in force until every condition of the agreement is met and the County releases it, and the surety must complete the work on default. Because these examples date from 2013, the agreement the County issues for the project is the document to read before relying on them.

Behind the drainage conditions is the Clark County Regional Flood Control District, created in 1986 by county ordinance under a 1985 state law and funded by a one-quarter of 1% sales tax approved September 2, 1986, with first construction in 1988. Its 2026-2027 fact sheet, with figures as of June 2026, reports about $2.52 billion invested, including about $251 million from the U.S. Army Corps of Engineers for the Tropicana and Flamingo Washes, 113 detention basins and about 722 miles of channels in operation. It also reports 65 square miles removed from FEMA special flood hazard areas and a Master Plan about 75% complete, with another 31 basins and about 217 miles of conveyance planned, and the district's charge includes establishing regulations for development in flood hazard areas. More planned facilities can mean more parcels next to or draining into a Master Plan facility, one of the drainage study triggers above.

- Performance bond: County blue bond form, surety listed in Treasury Circular 570
- Cash-in-lieu agreement: Nevada bank, capped at $250,000
- Cash bond: cashier's check
- Insurance with the bond package: $1,000,000 liability certificate, Clark County as additional insured and certificate holder
- Example off-site agreement (2013): one-year warranty from acceptance, $1,000,000 combined single limit per occurrence

How post-acceptance warranty security typically works is covered under [maintenance and warranty bonds after acceptance](https://mycontractorsinsurancequote.com/construction-surety-bonds/maintenance-warranty-bonds).

## Building a Program for Unincorporated County Work

A county program usually starts with bond capacity sized to the full Public Works estimate across every open map, a surety that meets the Circular 570 and A.M. Best test and a plan for the 80% reduction and final release. The liability side follows the certificate Public Works processes with the bond, the dust permit holder's obligations and completed-operations terms that run past the one-year warranty in the county's off-site improvements agreement. Terms can vary by carrier guidelines and programs, and every placement is subject to underwriting and the terms of the bonds and policies issued.

For parcels across the city line, compare [Henderson off-site bond and blasting insurance rules](https://mycontractorsinsurancequote.com/nevada/metros/las-vegas/henderson).

## Before You Ask for a Quote

### What to Gather
- Director of Public Works' estimate for the off-site improvements
- Off-site improvements agreement and the performance bond or cash-in-lieu form
- Surety's Nevada license, Circular 570 listing and current A.M. Best rating
- Certificate of Liability Insurance at $1,000,000 naming Clark County as additional insured and certificate holder, plus a W-9
- Dust Control Permit application covering acreage, trenching and demolition
- Drainage study and any Regional Flood Control District conditions

### What to Ask the Insurer or Surety
- Is the parcel in unincorporated Clark County or inside Las Vegas, Henderson or North Las Vegas?
- Does our surety meet the Circular 570 and A or better rating with a Stable or Positive outlook?
- Will the subdivision qualify for the one-time 80% reduction, and which utilities must agree?
- Does the county's current off-site improvements agreement still carry the one-year warranty and $1,000,000 liability terms in its 2013 example?
- Who holds the dust permit, and who answers for a notice of violation?
- Is the parcel inside the SNPLMA disposal boundary, so urban standards apply?

## Broker Notes

**Quick Answer:** Unincorporated Clark County requires a 100% performance bond or cash equal to the Public Works estimate before map recording or a building or grading permit, with a one-time 80% subdivision reduction and the final 20% released at acceptance.

**Common Mistake:** Assuming a city's warranty period or certificate limits apply to a county map. Title 30 is silent on warranty, but the county's example off-site improvements agreement sets a one-year warranty from acceptance, and the Posting Bonds checklist calls for a $1,000,000 certificate naming Clark County.

**Broker Perspective:** A broker checks the surety against Title 30's Circular 570 and A.M. Best test early, because a surety that fails it can delay the first grading permit on a county project.

**Coverage Impact:** The off-site bond protects the county, and the developer owes the surety indemnity. Dust and drainage obligations are contract and permit duties, and whether a liability or pollution policy responds depends on its terms.

## Questions Buyers Ask

### How much security does unincorporated Clark County require for off-site improvements?

Title 30 section 30.04.08C.3 calls for either a 100% performance bond or a cash deposit equal to the Director of Public Works' estimate of the total cost. It is due before the subdivision map records or before a building or grading permit issues.

### Can a Clark County subdivision bond be reduced before the work is accepted?

Title 30 allows a one-time 80% reduction for subdivision projects when only sidewalks, utility pads or boxes and slurry seal remain, with the utilities agreeing. The remaining 20% is released when that work is completed and the improvements are accepted for maintenance. The Public Works Posting Bonds checklist, revised September 19, 2024, says partial releases are available only on the cash forms, so confirm with Public Works whether a surety bond qualifies.

### What surety rating does Clark County accept on an off-site bond?

The code asks for a surety licensed in Nevada, listed in Treasury Circular 570 and rated A or better by A.M. Best with a Rating Outlook of Stable or Positive. Confirm the current standard with the county before the bond is executed.

### When does a Clark County project need a dust control permit?

The Department of Environment and Sustainability requires a Dust Control Operating Permit at 0.25 acre or more of soil disturbance or construction, 100 feet or more of mechanized trenching or 1,000 square feet or more of mechanical demolition.

### Do Clark County rules apply inside Las Vegas, Henderson or North Las Vegas?

No. Title 30 and the county's improvement agreements govern unincorporated areas. The City of Las Vegas, Henderson and North Las Vegas set their own bond forms and acceptance terms, though the county's dust program reaches across the valley.

### What warranty and insurance does Clark County's off-site improvements agreement call for?

The example agreement Public Works posts, dated 2013, sets a one-year warranty from the County's acceptance, with defects corrected within 30 days of notice, and general liability of at least $1,000,000 combined single limit per occurrence naming the County as additional insured. Confirm the terms in the agreement issued for your project.

## Official Sources

1. [Clark County Title 30 Unified Development Code (latest amendment effective September 17, 2026), sections 30.04.08, 30.06.11E and 30.07](https://www.clarkcountynv.gov/adobe/assets/urn:aaid:aem:a5729074-902a-47c2-9b8c-5cb520f8f28d/original/as/OFFTitle30.EFF.10.7.2026.pdf), Clark County Department of Comprehensive Planning. 100% performance bond or cash deposit equal to the Public Works estimate; timing before map recording or building or grading permit; Nevada-licensed, Circular 570, A.M. Best A or better surety; cash capped at FDIC or NCUA insured amount with 10% retention; one-time 80% subdivision reduction and final 20% release at acceptance; two-year completion from permit issuance or approved Extension of Time; dust permit above one quarter acre; Regional Flood Control District drainage regulations; Urban Area defined by the SNPLMA disposal boundary. Verified 2026-10-26.
2. [Bond Processing](https://www.clarkcountynv.gov/government/departments/public_works_department/development/bond-processing), Clark County Public Works, Development. Off-site improvements agreements, performance bond, cash-in-lieu bond, bond estimate fees, Certificate of Liability Insurance and W-9 forms processed together; originals required. Verified 2026-10-26.
3. [Dust Permitting Forms](https://clarkcountynv.gov/government/departments/environment_and_sustainability/division_of_air_quality/permitting/applications_forms/dust-permitting-forms), Clark County Department of Environment and Sustainability, Division of Air Quality. Dust Control Operating Permit thresholds: 0.25 acre soil disturbance or construction, 100 feet mechanized trenching, 1,000 square feet mechanical demolition. Verified 2026-10-26.
4. [2025 Population Estimates, Population by Place (August 2025 roll close)](https://www.clarkcountynv.gov/adobe/assets/urn:aaid:aem:c3b87585-b3e7-4565-a325-d401f3c21a7a/original/as/2025_Place_Population.pdf), Clark County. County population 2,465,431; unincorporated areas 1,073,926; Enterprise 261,749. Verified 2026-10-26.
5. [BLM finalizes major southern Nevada land sale to address housing needs (September 10, 2026)](https://www.blm.gov/press-release/blm-finalizes-major-southern-nevada-land-sale-address-housing-needs), U.S. Bureau of Land Management. Nearly 940 acres inside the Las Vegas Valley disposal boundary sold to the City of Las Vegas for up to 6,000 homes; 10% of proceeds to the Southern Nevada Water Authority. Verified 2026-10-26.
6. [NRS Chapter 278, section 278.380](https://www.leg.state.nv.us/NRS/NRS-278.html), Nevada Legislature, Legislative Counsel Bureau. A governing body may require an improvement agreement to be secured by a good and sufficient bond or other security in the amount it determines. Verified 2026-10-26.
7. [Drainage Study](https://www.clarkcountynv.gov/government/departments/public_works_department/development/drainage-study), Clark County Public Works. Drainage study required for sites impacted by a FEMA Special Flood Hazard Area, next to or affected by a Master Plan facility or taking flows from a wash or facility; Drainage Review Group coordinates with the Regional Flood Control District on floodplain issues. Verified 2026-10-26.
8. [Offsite Improvement Permits](https://www.clarkcountynv.gov/government/departments/public_works_department/development/offsite-improvement-permits), Clark County Public Works. Bond estimate due with the first submittal; plan check minimum $300; drainage study approved before the off-site submittal. Verified 2026-10-26.
9. [Posting Bonds checklist (revised 09/19/2024)](https://www.clarkcountynv.gov/adobe/assets/urn:aaid:aem:9ab3ac16-bf29-4ba3-8810-c9ce6e2a943f/original/as/posting-bonds-9-19-2024.pdf), Clark County Public Works, Bonding. Three options: performance bond on the County blue bond form from a Circular 570 surety, cash-in-lieu agreement with a Nevada bank capped at $250,000 or cash bond by cashier's check; $1M liability certificate naming Clark County as additional insured and certificate holder; amounts match the approved bond estimate; partial releases only on cash forms. Verified 2026-10-26.
10. [Off-Site Improvements Agreement, example (9-18-13)](https://www.clarkcountynv.gov/adobe/assets/urn:aaid:aem:f9a20fd0-51b2-4889-90f4-4948a38c5f45/original/as/off-site-improvements-agreemen-example-9-18-13.pdf), Clark County Public Works. One-year warranty from County acceptance; defects corrected within 30 days of notice; broad indemnity reaching contractors and subcontractors; CGL at least $1,000,000 CSL per occurrence with the County as additional insured, primary, waiver of subrogation, 30 days' notice; security replenished within 30 days; draw after 60 days of suspended work. Verified 2026-10-26.
11. [Performance and Guaranty Bond, example (9-24-13)](https://www.clarkcountynv.gov/adobe/assets/urn:aaid:aem:661d7b1a-6a0c-4a7b-ae35-81a4cdd944db/original/as/performance-bond-example-9-24-13.pdf), Clark County Public Works. Bond remains in force until all off-site improvement agreement conditions are met and the County releases it; surety completes on default. Verified 2026-10-26.
12. [Certificate of Liability Insurance (ACORD 25 form)](https://www.clarkcountynv.gov/adobe/assets/urn:aaid:aem:8caa9505-5ec9-4c67-8bde-13431781fde8/original/as/certificate-of-liability-insurance.pdf), Clark County Public Works. Certificate holder Clark County Public Works Development Review; no pre-printed limits. Verified 2026-10-26.
13. [RFCD 2026-2027 Fact Sheet (June 2026)](https://www.regionalflood.org/Documents/About%20Us/District%20Facts/RFCD%202026-2027%20Fact%20Sheet.pdf), Clark County Regional Flood Control District. Created 1986 under a 1985 state law; one-quarter of 1% sales tax approved September 2, 1986; first construction 1988; about $2.52 billion invested including about $251 million from USACE; 113 detention basins and about 722 miles of channels; Master Plan about 75% complete with 31 basins and about 217 miles planned; 65 square miles removed from FEMA special flood hazard areas; charge includes regulations for development in flood hazard areas. Verified 2026-10-26.

## Related Decisions

- [Henderson off-site bond rules](https://mycontractorsinsurancequote.com/nevada/metros/las-vegas/henderson)
- [Nevada civil and infrastructure contractor insurance](https://mycontractorsinsurancequote.com/nevada/audiences/civil-infrastructure-contractors)
- [excavation and grading contractor insurance](https://mycontractorsinsurancequote.com/who-we-serve/civil-underground-utilities/excavation-and-grading-contractors)
- [builders risk for residential subdivisions](https://mycontractorsinsurancequote.com/builders-risk-insurance/residential-subdivisions)
- [maintenance and warranty bonds](https://mycontractorsinsurancequote.com/construction-surety-bonds/maintenance-warranty-bonds)

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