Water system · PWSID CA3610043
GOLDEN STATE WATER CO - BARSTOW
PWSID
CA3610043
State
California
City
APPLE VALLEY
Population served
32,547
Primary source
Groundwater
Score history
▼ 19 points — the score moved from 100 to 81 on Jun 18, 2026, as newly published EPA data was incorporated.
2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.
PFAS & contaminant readings
Latest detections from EPA’s UCMR5 monitoring (through Sep 2023). Levels in parts per trillion (ppt).
PFOA
Perfluorooctanoic acid
5.7 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
4.4 ppt
limit 10 ppt
Lithium
21,900 ppt
limit —
PFHxA
5.4 ppt
limit —
PFPeA
4.9 ppt
limit —
Violations & enforcement
1
Violations on record
0
Unaddressed
1
Health-based
2
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Apr 2018. Official EPA record →
Recent enforcement actions
- State action · SOX Apr 2018
- State action · SFL Jul 2010
Area water-quality monitoring
Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.
Nitrate
1 station · latest May 2022
Arsenic
1 station · latest May 2022
Fluoride
1 station · latest May 2022
Manganese
1 station · latest May 2022
Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.
This profile is built from EPA public records for system CA3610043 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.