Drinking water quality · 2023
· Verified
· PWSID CA3910017
What's in San Joaquin County-mokelumne Acres — Stockton, Ca, CA tap water
1 contaminant in San Joaquin County-mokelumne Acres — Stockton, Ca, CA's water sat at or above a federal limit, led by Tetrachloroethylene at 3.1x the limit.
- !1 contaminant at or above a federal limit — worst is Tetrachloroethylene at 3.1x
- !11 of 27 core regulated contaminants reported — 16 never appear in this report
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −32 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −13 core regulated contaminants never reported (11/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- Tetrachloroethylene3.1× the federal limit0–15.5 ug/L · limit 5 ug/L
A likely human carcinogen; long-term exposure above the federal limit can damage the liver and kidneys.
+12 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Nitrate | 0–3.4 mg/L | 10 mg/L |
| Copper | 266 ug/L | 1300 ug/L |
| Chlorine | 0.15–0.73 mg/L | 4 mg/L |
| Gross Alpha | 2.56 pCi/L | 15 pCi/L |
| Barium | 0–239 ug/L | 2000 ug/L |
| TTHM | 4–5 ug/L | 80 ug/L |
| HAA5 | Not detected ug/L | 60 ug/L |
| Lead | 0 ug/L | 15 ug/L |
| Vanadium | 18.5 ug/L | 50 ug/L |
| Escherichia coli (E. coli) | 0 | 0 |
| Total Coliform | 0 | 0 |
| Uranium | 1.86 pCi/L | 20 pCi/L |
What this report doesn't tell you
16 of the 27 contaminants a community water system normally reports do not appear anywhere in San Joaquin County-mokelumne Acres — Stockton, Ca, CA's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.