Golden State Water Company - Nipomo
EPA ID: CA4010018 · 4,506 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Golden State Water Company - Nipomo (CA4010018): no EPA violations recorded in the last five years. Federal monitoring records confirm Golden State Water Company - Nipomo has operated without any EPA violations for the full five-year window - covering every contaminant category and reporting cycle across a service area of approximately 4,506 residents, with no gaps in the compliance record.
Data: EPA SDWIS
Service Area Map
Coverage area for Golden State Water Company - Nipomo Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Golden State Water Company - Nipomo serves a community with a median household income of $105,655 and an estimated 21,495 residents across its service area.
🌊 Where Does Your Water Come From?
Golden State Water Company - Nipomo'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
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
Golden State Water Company - Nipomo (EPA ID: CA4010018) is a community water system in California that serves approximately 4,506 people from surface water sources.
This system serves ZIP code 93444 in Nipomo.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0052 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.
- 93444 - Nipomo
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Golden State Water Company - Nipomo (CA4010018) on EPA.gov.
Frequently Asked Questions
Is Golden State Water Company - Nipomo water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Golden State Water Company - Nipomo 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 Golden State Water Company - Nipomo serve?
Golden State Water Company - Nipomo serves approximately 4,506 people across 1 ZIP code in California.
Where does Golden State Water Company - Nipomo get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
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.). Golden State Water Company - Nipomo Water Quality Report, CA. https://zipcheckup.com/water-system/ca4010018/
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