Moon Valley Water System
EPA ID: CA4900871 · 691 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Moon Valley Water System (CA4900871): no EPA violations recorded in the last five years. Throughout five consecutive years of federal water monitoring, Moon Valley Water System recorded zero violations - solid performance for a utility serving 691 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Moon Valley Water System Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Moon Valley Water System serves a community with a median household income of $108,322 and an estimated 35,139 residents across its service area. Approximately 69% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Moon Valley Water System's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 6 detections recorded. 2 exceed federal EPA limits (4 ppt for PFOA/PFOS). 1 exceeds state limits.
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
Moon Valley Water System (EPA ID: CA4900871) is a community water system in California that serves approximately 691 people from groundwater sources.
This system serves ZIP code 95476 in Sonoma.
Violation History
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.
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.
- 95476 - Sonoma
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Moon Valley Water System (CA4900871) on EPA.gov.
Frequently Asked Questions
Is Moon Valley Water System water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Moon Valley Water System in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Moon Valley Water System serve?
Moon Valley Water System serves approximately 691 people across 1 ZIP code in California.
Where does Moon Valley Water System get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Moon Valley Water System Water Quality Report, CA. https://zipcheckup.com/water-system/ca4900871/
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