Backflow Testing in Napa County, California
AWWA-certified annual backflow testing across every Napa County purveyor, including specialty coverage for Napa Valley AVA winery premises.
- CCL: #1062017
- AWWA Backflow Tester Cert.: #15112
- AWWA Specialist Cert.: #03373
- 9 Napa purveyors covered
Serving: Napa, American Canyon, Calistoga, St. Helena, Yountville, Rutherford, Oakville, Angwin, Pope Valley.
Do I need backflow testing in Napa County?
If you have a backflow prevention assembly on a Napa County service, yes. Each city and special district runs a cross-connection program under its own code, aligned with the CA SWRCB CCCPH. Winery properties in particular carry elevated-hazard classifications.
“All installed backflow prevention devices must be tested annually by a certified backflow prevention tester and immediately repaired if necessary.”
The 2024 Napa County winegrape crop was valued at over $1.03 billion on 45,967 bearing acres, across a dense cluster of bonded wineries operating through the Napa Valley AVA and its 16 sub-AVAs. High-hazard premises throughout.
Not sure which utility serves your address? Call (800) 684-8346.
Water purveyors in Napa County requiring annual testing
Five incorporated jurisdictions plus a handful of special districts govern retail water in Napa County.
| Purveyor | Service Area | Governing Rule |
|---|---|---|
| City of Napa Water Division | City of Napa + wholesale to Congress Valley WD | City of Napa Cross-Connection Control Program Plan (eff. Dec 4, 2025); Napa MC Title 13 — Water Contamination Prevention |
| City of American Canyon Public Works | City of American Canyon | American Canyon Municipal Code Title 13 — Water Service System; SWRCB CCCPH |
| City of Calistoga | City of Calistoga | Calistoga Municipal Code Chapter 13.04 — Water Service (Ord. 358, 1980) |
| City of St. Helena | City of St. Helena | St. Helena Municipal Code Chapter 13.08 — Cross-Connection Control Program; § 13.08.040 Backflow Prevention Devices |
| Town of Yountville Utility Operations | Town of Yountville | Yountville Municipal Code Chapter 13.18 — Cross-Connection Control Program |
| Congress Valley Water District | Unincorporated area west of City of Napa | CVWD District Rules (wholesale from City of Napa); SWRCB CCCPH |
| Circle Oaks County Water District | Circle Oaks community (~189 customers) | COCWD District Rules; SWRCB CCCPH |
| Spanish Flat Water District | Berryessa Pines and Spanish Flat (Lake Berryessa) | Spanish Flat WD Rules; SWRCB CCCPH |
| Lake Berryessa Resort Improvement District (LBRID) | Unit 2 of Berryessa Estates, Pope Valley | Napa County-administered RID; SWRCB CCCPH |
“All backflow prevention assemblies are required to be tested on an annual basis. Tests must be performed by an AWWA Certified Backflow Assembly Tester.”
How our testing process works
- 1
Identify your purveyor
City of Napa, American Canyon, Calistoga, St. Helena, Yountville, or one of the special districts (Congress Valley, Circle Oaks, Spanish Flat, LBRID).
- 2
On-site test (10 – 20 minutes)
Certified test procedure with calibrated gauges. Winery premises often require a multi-device routing plan.
- 3
If a device fails
We quote the repair on site and schedule the retest.
- 4
Report filed within 24 hours
We submit to your purveyor and send you a copy with the invoice.
- 5
Annual reminder
We track your anniversary date and reach out ahead of next year's deadline.
Devices we test
ASSE 1013
Reduced Pressure Assembly (RPA / RPZ)
High-hazard: winery CIP caustic/acid loops, jacketed glycol-chilled fermentation tanks, chemigation in vineyards, boiler feed, bottling-line rinse, hospital process water.
ASSE 1015
Double Check Valve Assembly (DCVA)
Residential fire lines, commercial irrigation without chemical injection, HOA landscape meters.
ASSE 1020
Pressure Vacuum Breaker (PVB)
Above-ground irrigation protection — very common on winery estate homes and vineyard landscape irrigation.
ASSE 1056
Spill-Resistant Vacuum Breaker (SVB)
Modern PVB variant; standard retrofit when a legacy PVB reaches end of life.
California and federal compliance context
“The Cross-Connection Control Policy Handbook (CCCPH) took effect July 1, 2024.”
$1.03B
2024 Napa County winegrape crop value across 45,967 bearing acres (Napa County 2024 Crop Report).
Authorities: AWWA M14 5th ed., USC FCCCHR, EPA CCC Manual, H&S Code § 116800.
Cities we serve in Napa County
Napa
Largest city and county seat. Providence Queen of the Valley Medical Center (~198 beds) anchors hospital RP load. The City's Cross-Connection Control Program Plan (effective Dec 4, 2025) governs.
American Canyon
Southern Napa County. Mix of residential and light-industrial on Napa MC Title 13. I-80 commercial corridor drives fire-line DCVA volume.
Calistoga
North end of the valley. Calistoga MC Ch. 13.04 (Ord. 358). Hotel-resort density (Dr. Wilkinson's, Indian Springs, Solage, Four Seasons, Calistoga Motor Lodge) drives commercial RP volume on kitchens, spas, and pools.
St. Helena
St. Helena MC § 13.08.040 explicitly requires annual testing. Adventist Health St. Helena (151 beds) is the area's anchor hospital; Beringer, Charles Krug, and Raymond drive winery RP demand.
Yountville
Yountville MC Ch. 13.18. The Veterans Home of California Yountville (largest US veterans home) and The French Laundry/V Marketplace are concentrated commercial accounts under the Town's in-house AWWA-certified tester operation.
Rutherford, Oakville, Angwin, Pope Valley
Unincorporated AVAs. Wine-country residential PVB + winery RP work predominate. LBRID serves the Berryessa Estates pocket; Circle Oaks and Spanish Flat cover small foothill communities.
Coombsville AVA
Just east of the City of Napa. Served by City of Napa. Heavy residential + boutique winery mix; irrigation PVB volume is substantial.
Our credentials
California
CCL #1062017
Active contractor state license.
Backflow tester
AWWA Backflow Tester Cert. #15112
AWWA-certified tester.
Specialist
AWWA Specialist Cert. #03373
Cross-Connection Control Specialist.
Family-owned
Jesse Cuevas
Owner and lead tester.
Jesse Cuevas has 13+ years in backflow prevention, installation, testing, and repair, including winery CIP and process-water systems. We file directly with every Napa purveyor we cover, and field work is not sub-contracted.
Frequently asked questions
How often is backflow testing required in Napa County?
Every purveyor in Napa County requires an annual test, aligned with the California State Water Resources Control Board Cross-Connection Control Policy Handbook (effective July 1, 2024). The City of Napa states plainly that all installed backflow prevention devices must be tested annually by a certified tester.
Which water purveyors in Napa County require annual testing?
City of Napa (Cross-Connection Control Program Plan, eff. Dec 4, 2025), City of American Canyon, City of Calistoga (MC Ch. 13.04), City of St. Helena (MC § 13.08.040), Town of Yountville (MC Ch. 13.18), Congress Valley Water District, Circle Oaks County Water District, Spanish Flat Water District, and Lake Berryessa Resort Improvement District all require annual testing.
What happens if my device fails the test?
We explain the failure on site, quote the repair (commonly a rubber kit, check, or relief valve), and schedule the retest. We avoid starting work without your approval. Purveyors can ultimately curtail service for uncorrected failures.
Who is legally allowed to test backflow devices in California?
Only a backflow prevention assembly tester certified by AWWA or the USC FCCCHR and listed on the applicable purveyor's approved tester roster. Our lead specialist holds AWWA Backflow Tester Cert. #15112 and AWWA Specialist Cert. #03373. The company carries CCL #1062017.
Do Napa Valley wineries need backflow testing?
Yes. Winery premises are classic high-hazard under every cross-connection ordinance: CIP caustic/acid loops, glycol-chilled jacketed fermentation tanks, chemigation in vineyards, sulfite handling, bottling-line rinse, and boiler feedwater all require reduced-pressure (RP) assemblies with annual testing.
How do I submit my test report to the City of Napa?
We file the certified test report form on your behalf directly with the City of Napa Water Division Backflow Specialist within 24 hours of the test, and send you a copy with the invoice.
Annual deadlines in Napa County are enforced by each city or district. Non-compliance can result in water service shut-off.
Mon – Sat, 7:30 AM to 5:00 PM. Emergency response available.
Sources and authorities cited on this page
California state authority. CA SWRCB CCCPH, CA H&S Code § 116800.
Federal + standards. EPA CCC Manual, AWWA M14 5th ed., USC FCCCHR.
Napa County purveyors. City of Napa, American Canyon, Calistoga, St. Helena MC Ch. 13.08, Yountville.