Compliance record
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 8120.18 µg/L 81% of the EPA limit 10000 µg/L
worst single sample: 9695.4 µg/L | 74/90 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 31/31 | LCR | 2024 |
| Combined Uranium | 32.7725 µg/L 109% of the EPA limit, at the 95th percentile of samples — 30 µg/L
worst single sample: 34.419 µg/L | 14/14 | SYR4 | 2012–2019 |
| Arsenic | 7 µg/L 70% of the EPA limit 10 µg/L | 13/13 | SYR4 | 2013–2019 |
| Barium | 355.65 µg/L 18% of the EPA limit 2000 µg/L
worst single sample: 357 µg/L | 10/13 | SYR4 | 2013–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0560 µg/L 28% of the EPA limit 0.2000 µg/L
worst single sample: 0.0600 µg/L | 9/21 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 586225 µg/L 5862% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 900000 µg/L | 8/10 | SYR4 | 2013–2019 |
| Dibromochloromethane | 3.7 µg/L No EPA limit set
worst single sample: 4 µg/L | 7/11 | SYR4 | 2014–2019 |
| TTHM | 12.1 µg/L 15% of the EPA limit 80 µg/L
worst single sample: 13 µg/L | 7/11 | SYR4 | 2014–2019 |
| Bromodichloromethane | 2.75 µg/L No EPA limit set
worst single sample: 3 µg/L | 6/11 | SYR4 | 2014–2019 |
| Bromoform | 5.25 µg/L No EPA limit set
worst single sample: 6 µg/L | 6/11 | SYR4 | 2014–2019 |
| Chloroform | 1.91 µg/L No EPA limit set
worst single sample: 2 µg/L | 4/11 | SYR4 | 2014–2019 |
| Chromium | 3.7 µg/L 3.7% of the EPA limit 100 µg/L
worst single sample: 4 µg/L | 4/13 | SYR4 | 2013–2019 |
| Total Haloacetic Acids (HAA5) | 1.85 µg/L 3.1% of the EPA limit 60 µg/L
worst single sample: 2 µg/L | 4/11 | SYR4 | 2014–2019 |
| Dibromoacetic Acid | 1.9 µg/L No EPA limit set
worst single sample: 2 µg/L | 3/11 | SYR4 | 2014–2019 |
| Fluoride | 100 µg/L 2.5% of the EPA limit 4000 µg/L | 3/13 | SYR4 | 2013–2019 |
| Mercury | 0.2950 µg/L 15% of the EPA limit 2 µg/L
worst single sample: 0.3200 µg/L | 3/13 | SYR4 | 2013–2019 |
| Lead | 1.275 µg/L 8.5% of the EPA limit 15 µg/L
worst single sample: 1.3 µg/L | 2/13 | SYR4 | 2013–2019 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set | 1/11 | SYR4 | 2014–2019 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L | 1/13 | SYR4 | 2013–2019 |
| Tetrachloroethylene | 1.7 µg/L 34% of the EPA limit 5 µg/L | 1/15 | SYR4 | 2012–2019 |
56 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBenzeneBeryllium, TotalChlorobenzeneCopperCadmiumCarbon TetrachlorideDichloromethaneDichloroacetic AcidEthylene DibromideEthylbenzeneHfpo-DaMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaSimazineStyreneThallium, TotalTolueneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about San Joaquin County-Mokelumne Acres
Is San Joaquin County-Mokelumne Acres tap water safe to drink?
EPA monitoring detected 27 contaminants in San Joaquin County-Mokelumne Acres's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in San Joaquin County-Mokelumne Acres's water?
EPA monitoring detected Nitrate, Lead, Combined Uranium, Arsenic, Barium, and others. The full list with the level and data source for each is above.
How many people does San Joaquin County-Mokelumne Acres serve?
San Joaquin County-Mokelumne Acres reports serving 3,802 people in California, per its EPA record.
Has San Joaquin County-Mokelumne Acres had any water quality violations?
The EPA has no formal drinking-water violations on file for San Joaquin County-Mokelumne Acres.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.