Why Natomas Is Different: The A99 Designation
The City of Sacramento explains that FEMA remapped the Natomas Basin into an AE zone in December 2008 after the Army Corps of Engineers re-evaluated the levees, and that the elevation required under AE was up to 20 feet in some areas, which the City describes as a de facto building moratorium. As of June 16, 2015, the City obtained a new flood map giving Natomas an A99 designation, an interim zone that is still high risk but allows construction with local conditions.
For developers, that history explains why Natomas has a deep pipeline of residential and commercial land behind levees, and why projects there are typically underwritten as flood-exposed even though building is permitted. Lenders read the same map, so flood questions show up in loan exhibits as well as in insurance submissions.
State-level licensing, bonding and subdivision rules that apply alongside Sacramento's flood rules are on the page for California construction project insurance and bonding.
What the City Requires for New Construction Since July 2024
The City states that new FEMA regulations took effect in the A99 zone on July 1, 2024. Projects proposing new construction or substantial improvement or damage must meet flood requirements. Residential lowest floors, including basements, must sit at least one foot above the highest adjacent 100-year hydraulic grade line of the City's drainage system and at least 18 inches above the controlling overland release point in the right of way. Commercial structures may elevate or floodproof to the same standard.
Each project must provide elevation certificates signed by a registered engineer, surveyor or architect, plus a floodproofing certificate where floodproofing is used, and the owner must execute a hold harmless agreement with the City. The City also notes that 200-year floodplain requirements took effect in July 2016. Those requirements shape design and schedule, and they give underwriters documents they will want to see.
How residential and multifamily projects are typically insured from grading to close is covered on the project page for residential and multifamily construction insurance.
Builders Risk and Flood During Construction
Builders risk forms commonly exclude flood or offer it with a sublimit and a separate deductible, and some markets limit flood capacity in a Special Flood Hazard Area. On a Natomas project, assume flood must be asked for, priced and documented. Confirm how the policy defines flood versus surface water or drainage backup.
The construction period is also when a building is least protected. Floor elevation may not be finished, floodproofing may not be installed and materials sit on grade. Ask whether the flood sublimit fits the value at risk at peak, whether stored materials are included and whether the deductible is a flat amount or a percentage of values. Lenders often specify flood requirements, so compare their exhibit with what the market will offer before the loan closes.
How perils, sublimits and deductibles are typically set is explained in builders risk with flood and water damage terms.
The Hold Harmless Agreement and Your Liability Program
A hold harmless agreement with the City is a contractual promise. Whether a commercial general liability policy responds to liability assumed in it depends on the policy's insured-contract definition and any endorsements that narrow it. Developers should have the agreement and their GL form reviewed together, and should consider whether the obligation passes down to the GC and trade contracts.
It also matters after completion. If a flood later damages third parties and a claim reaches the City, the hold harmless can bring the owner into it. Completed-operations coverage, project-specific limits and how long they stay in force are worth a direct conversation when the project sits in a Special Flood Hazard Area.
How insured-contract wording and project limits typically work is covered in project-specific liability and contractual risk transfer.
Work Near Levees and Encroachment Approvals
The City advises builders not to dig, plant or build at the base of a levee and directs anyone building near a levee to the Central Valley Flood Protection Board for encroachment regulations. Utility crossings, outfalls, grading and access roads near levees can require approvals beyond the City permit, with their own conditions.
For civil and underground contractors, that adds a regulator and a set of conditions to the job, and it puts work close to flood-control infrastructure where damage could be costly. Contract indemnity, additional-insured requirements and pollution exposure from dewatering near levees should be reviewed before mobilizing. Bonds required by public owners protect the agency, and the contractor owes the surety indemnity if a claim is paid.
Coverage and bonding for utility, grading and storm drain contractors is set out for insurance and bonds for civil and underground contractors.
City Encroachment Permits: Insurance, Traffic Control and Trench Cuts
Work that breaks ground in the City of Sacramento right of way, such as water, sewer, gas or electric connections trenched through sidewalk or roadway, uses the City's Construction encroachment application. The City's instructions (form DE-300, revised September 8, 2025) call for general liability of $500,000 combined single limit, an Acord certificate plus a separate additional insured endorsement page and traffic control plans that follow the California MUTCD. Work lasting 5 or more days needs separate pedestrian, bicycle and vehicle control. A deposit covers review and inspection hours, and a trench cut fee may apply.
The $500,000 figure is a permit minimum, not a recommendation. Owner contracts, lenders and primes typically require higher limits, and because the endorsement page is required, a certificate alone may not clear intake. Confirm the current requirement with the City before mobilizing.
How right-of-way security typically works statewide is explained in California encroachment permit bonds.
Unincorporated Sacramento County: Deposits, Timing and Fines
Sacramento County's Department of Transportation requires an encroachment permit for construction in the County right of way and a $2,500 security deposit before issuance, with a $360.50 fee for most permits plus hourly inspection. One County page says review typically takes 1 to 3 weeks and another cites about 10 business days, so plan for the longer figure. Under County Code Section 12.08, unpermitted right-of-way work can draw fines up to $2,500 for a first offense, rising to $10,000 per offense.
The deposit is modest, but fines and stop-work exposure fall on whoever starts without the permit, so subcontracts typically assign that duty clearly.
Elk Grove sets its own security, insurance and guarantee terms, covered in Elk Grove construction insurance and encroachment permits.
Assembling a Sacramento Program
A Sacramento project in Natomas or another mapped flood area usually needs flood priced into builders risk, a GL program that has been checked against the City's hold harmless agreement plus a plan for levee-adjacent work. Commercial projects that floodproof rather than elevate add a design element whose performance can surface in later claims.
Collect the elevation certificate plan, the hold harmless form and the lender's exhibit first, then build the submission around them. To review a specific Sacramento project, request a quote or call 844-978-7283.
Before You Ask for a Quote
What to Gather
- The parcel's FEMA zone and the City's A99 or 200-year floodplain requirements
- Elevation certificate plan and any floodproofing design
- The City hold harmless agreement form
- Lender insurance exhibit, including flood requirements
- Any levee encroachment application or approval
- Construction schedule showing when floors reach required elevation
What to Ask the Insurer or Surety
- Is flood available on builders risk, at what sublimit and with what deductible?
- How does the policy define flood versus surface water and drainage backup?
- Does the GL insured-contract definition reach the City hold harmless agreement?
- Should the hold harmless obligation flow down to the GC and subcontractors?
- How do floodproofed commercial floors affect completed-operations exposure?
- What conditions apply to work near a levee, and who carries that exposure?
Quick Answer
Sacramento's Natomas Basin is an A99 Special Flood Hazard Area where building is allowed with elevation or floodproofing, signed certificates and a hold harmless agreement with the City. Flood and contractual liability need to be planned up front.
Common Mistake
Signing the City's hold harmless agreement without checking whether the GL policy's insured-contract wording reaches it, and buying builders risk without asking for flood.
Broker Perspective
In Natomas, read the flood map, the hold harmless form and the lender exhibit together. They tell you what the builders risk and GL program must answer.
Coverage Impact
Flood is commonly excluded or sublimited on builders risk; GL may respond to assumed liability only if the agreement fits the insured-contract definition; bonds protect public owners, not the contractor.
Questions Buyers Ask
Can we build in Natomas without flood coverage on the builders risk?
The City allows construction in the A99 zone, but it is still a Special Flood Hazard Area, and many builders risk forms exclude flood unless it is added. Lenders often require it. Ask the market for a flood sublimit sized to peak construction values and confirm the deductible and the flood definition before work starts.
What is the City of Sacramento hold harmless agreement for flood zone permits?
Since July 1, 2024, the City has required owners of new construction or substantial improvements in the A99 zone to execute a hold harmless agreement with the City, along with elevation and floodproofing certificates. It is a contractual obligation. Have it reviewed against your general liability policy's insured-contract wording before you sign.
Does floodproofing a commercial ground floor change our insurance?
It can. Floodproofing is a design element whose performance may be tested in a later flood. Claims could reach the designer, the GC and the installer. Completed-operations coverage may respond to resulting property damage depending on the form and flood exclusions. Ask how long completed-operations coverage stays in force on the project.
Do we need approval from the flood board to work near a Sacramento levee?
Possibly. The City tells builders not to dig, plant or build at the base of a levee and directs anyone building near one to the Central Valley Flood Protection Board's encroachment regulations. Confirm with the Board whether your outfall, crossing or grading needs a permit, and review the indemnity and insurance conditions that come with it.
Official Sources
- Natomas Floodplain, City of Sacramento Department of Utilities. Natomas A99 designation as of June 16, 2015; 2008 AE remapping with elevation up to 20 feet and a de facto building moratorium; A99 is interim, still high risk, but allows construction with local conditions. Verified 2026-10-23.
- Flood Zone Construction Requirements, City of Sacramento Department of Utilities. A99 rules effective July 1, 2024: elevation one foot above the 100-year HGL and 18 inches above the overland release point; floodproofing option for commercial; signed elevation and floodproofing certificates; hold harmless agreement with the City; 200-year floodplain requirements effective July 2016; levee guidance pointing to the Central Valley Flood Protection Board. Verified 2026-10-23.
- Minor Encroachment Permit Instructions (DE-300), City of Sacramento Department of Public Works. Rev. 09/08/2025: Construction encroachment permits for work that breaks ground in the right of way; general liability coverage $500,000 combined single limit; Acord form and separate Additional Insured Endorsement page; traffic control plans compliant with the California MUTCD, with separate pedestrian, bicycle and vehicular control for projects lasting 5 or more days; permit deposit based on review and inspection hours; trench cut fee may be assessed. Verified 2026-10-27.
- Encroachment Permit Review, Sacramento County Department of Transportation. Permits needed for all construction work within the County right of way; $103 new driveway and $360.50 other permit fees plus hourly inspection; $2,500 security deposit prior to issuance; review typically takes 1 to 3 weeks. Verified 2026-10-27.
- Encroachment Violation Enforcement, Sacramento County Department of Transportation. Under County Code section 12.08, unpermitted construction in the right of way is subject to fines of up to $2,500 for the first offense, increasing up to $10,000 per offense. Verified 2026-10-27.
- Encroachment Permits (Site Improvement and Permits Section), Sacramento County Engineering. The turn-around time for issuance of encroachment permits is approximately 10 business days. Verified 2026-10-27.
Reviewed by the Principal, Gleason Insurance Brokers, LLCUpdated



