Armstrong Valley-cal Water Service (puc)
EPA ID: CA4910018 · 473 people served · 2 ZIP codes
ZipCheckup's reading of EPA records for Armstrong Valley-cal Water Service (puc) (CA4910018): no drinking-water violations recorded since 2021. No violations appear in the federal EPA file for Armstrong Valley-cal Water Service (puc), which supplies 473 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Armstrong Valley-cal Water Service (puc) Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Armstrong Valley-cal Water Service (puc) have a median household income of $78,845 and about 5,412 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 82% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Armstrong Valley-cal Water Service (puc)'s water is classified in EPA records as a groundwater source. 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
Comparable Water Systems
Similar-sized systems in California
System Overview
Armstrong Valley-cal Water Service (puc) (EPA ID: CA4910018) is a community water system in California that serves approximately 473 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0032 mg/L | No | 2025-12-31 |
The accepted LCR snapshot contains 1 reported copper action-level exceedance record for this PWSID. The source does not provide a verified copper level for publication.
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: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
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.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Armstrong Valley-cal Water Service (puc) (CA4910018) on EPA.gov.
Frequently Asked Questions
Is Armstrong Valley-cal Water Service (puc) water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Armstrong Valley-cal Water Service (puc) 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 Armstrong Valley-cal Water Service (puc) serve?
Armstrong Valley-cal Water Service (puc) serves approximately 473 people across 2 ZIP codes in California.
Where does Armstrong Valley-cal Water Service (puc) get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Armstrong Valley-cal Water Service (puc) Water Report, CA. https://zipcheckup.com/water-system/ca4910018/
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