PWSID
CA0110008
State
California
City
PLEASANTON
Population served
76,689
Primary source
SWP
Score history
▼ 70 points — the score moved from 100 to 30 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 May 2025). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
26 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
18 ppt
limit 10 ppt
PFOA
Perfluorooctanoic acid
4.2 ppt
limit 4 ppt
Lithium
9,620 ppt
limit —
PFBS
6.1 ppt
limit —
PFBA
6 ppt
limit —
PFPeS
4.3 ppt
limit —
PFHxA
3.6 ppt
limit —
PFPeA
3.2 ppt
limit —
Violations & enforcement
2
Violations on record
0
Unaddressed
2
Health-based
4
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Nov 1996. Official EPA record →
Recent enforcement actions
- State action · SFJ Nov 1996
- State action · SOX Feb 1996
- State action · SIE Jan 1996
- State action · SOX Dec 1995
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
2 stations · latest May 2020
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 CA0110008 — 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.