City of St. Helena
EPA ID: CA2810004 · 5,386 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for City of St. Helena (CA2810004): 1 unresolved EPA violation on record. Tallying the federal enforcement file for City of St. Helena yields 1 open violation that has not been formally closed - each finding sits in the EPA database while the utility continues to deliver water to approximately 5,386 residents and works through the required corrective action process.
Data: EPA SDWIS
Service Area Map
Coverage area for City of St. Helena Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The City of St. Helena serves a community with a median household income of $139,779 and an estimated 7,646 residents across its service area. Approximately 75% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
City of St. Helena's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
Infrastructure Risk
Detected Contaminants
How City of St. Helena compares to EPA limits
What This Means For You
Total Trihalomethanes (TTHM) at 6 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Stage 1 DBP Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Total Trihalomethanes (TTHM) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in California
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
City of St. Helena, (EPA ID: CA2810004) is a community water system in California that serves approximately 5,386 people from surface water sources.
This system serves ZIP code 94574 in Saint Helena.
Violation History
Status breakdown for accepted records with record years 2021-2026: 0 resolved, 6 archived, 0 addressed, and 1 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2023 | Total Trihalomethanes (TTHM) | Health-based | Archived |
| April 1, 2023 | Total Trihalomethanes (TTHM) | Health-based | Archived |
| January 1, 2023 | Total Trihalomethanes (TTHM) | Health-based | Archived |
| October 1, 2022 | Stage 1 DBP Rule | Non-health-based | Unaddressed (current) |
| January 1, 2021 | Total Trihalomethanes (TTHM) | Health-based | Archived |
| January 1, 2021 | Total Trihalomethanes (TTHM) | Health-based | Archived |
| January 1, 2021 | Total Trihalomethanes (TTHM) | Health-based | Archived |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 6 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
Health Risk Details
Total Trihalomethanes (TTHM) (EPA limit: 0.08 mg/L)
Bladder & rectal cancer risk; reproductive concerns At-risk groups: pregnant women, long-term consumers of chlorinated water, people who frequently shower in chlorinated water.
Removal methods: granular activated carbon (GAC), carbon block filter, point-of-entry aeration. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by CA or modeled from parcel and building-footprint data.
- 94574 - Saint Helena
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of St. Helena (CA2810004) on EPA.gov.
Frequently Asked Questions
Is City of St. Helena water safe to drink?
The accepted 2026Q2 ECHO snapshot shows 1 current noncompliance record and zero current records classified as health-based. That classification is not a property-specific water test or safety guarantee.
How many people does City of St. Helena serve?
City of St. Helena serves approximately 5,386 people across 1 ZIP code in California.
Where does City of St. Helena get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). City of St. Helena (CA): 6 Health Violations. https://zipcheckup.com/water-system/ca2810004/
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title = {{City of St. Helena (CA): 6 Health Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ca2810004/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
City of St. Helena (EPA ID: CA2810004) - request the latest Consumer Confidence Report or ask about specific contaminants.