PWSID
CA3010046
State
California
City
TUSTIN
Population served
66,600
Primary source
SWP
Score history
▼ 9 points — the score moved from 100 to 91 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 Nov 2025). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
4.2 ppt
limit 4 ppt
PFHxS
Perfluorohexanesulfonic acid
3.5 ppt
limit 10 ppt
Lithium
10,852 ppt
limit —
PFPeA
3.7 ppt
limit —
Violations & enforcement
5
Violations on record
0
Unaddressed
1
Health-based
13
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Jun 2018. Official EPA record →
Recent enforcement actions
- State action · SFJ Jun 2018
- State action · SOX Jun 2018
- State action · SIA Aug 2016
- State action · SOX Aug 2016
- State action · SOX Dec 2006
- State action · SIA Dec 2006
- EPA/federal action · EOX Mar 2000
- State action · SFJ Oct 1998
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 Jul 2020
Arsenic
1 station · latest Jul 2020
Copper
1 station · latest Jul 2020
Fluoride
1 station · latest Jul 2020
Lead
1 station · latest Jul 2020
Uranium
1 station · latest Jul 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 CA3010046 — 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.