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Tap water quality report

Fremont One

EPA monitoring tested this supplier for 40 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

40
contaminants tested
8
detected
39
people served
22
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
San Joaquin

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

22
health-based violations
22
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2026-01-01 → 2026-03-31
MCL Health-based Archived 2025-10-01 → 2025-12-31
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-04-01 → 2025-06-30
MCL Health-based Archived 2025-01-01 → 2025-03-31
MCL Health-based Archived 2024-10-01 → 2024-12-31
MCL Health-based Archived 2024-07-01 → 2024-09-30
MCL Health-based Archived 2024-04-01 → 2024-06-30
MCL Health-based Archived 2024-01-01 → 2024-03-31
MCL Health-based Archived 2023-10-01 → 2023-12-31

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
10825.4 µg/L 108%
of the EPA limit, in the worst sample — 10000 µg/L
 52/52 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 6/6 LCR 2024
Arsenic
6 µg/L 60%
of the EPA limit 10 µg/L
 2/2 SYR4 2014–2017
Barium
308 µg/L 15%
of the EPA limit 2000 µg/L
 2/2 SYR4 2014–2017
Combined Uranium
23.095 µg/L 77%
of the EPA limit 30 µg/L
 2/2 SYR4 2014–2017
Chromium
7 µg/L 7%
of the EPA limit 100 µg/L
 1/2 SYR4 2014–2017
Nitrate-Nitrite
4000 µg/L 40%
of the EPA limit 10000 µg/L
 1/1 SYR4 2017
Selenium
1 µg/L 2%
of the EPA limit 50 µg/L
 1/2 SYR4 2014–2017
32 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalBenzeneBeryllium, TotalChlorobenzeneCopperCadmiumCarbon TetrachlorideDichloromethaneEthylene DibromideEthylbenzeneFluorideLeadMercuryNitriteStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HERNANDEZ, JUAN J.
Phone
209-507-9621
Email
bettosbirria73@gmail.com

Frequently asked questions about Fremont One

Is Fremont One tap water safe to drink?

EPA monitoring detected 8 contaminants in Fremont One'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 Fremont One's water?

EPA monitoring detected Nitrate, Lead, Arsenic, Barium, Combined Uranium, and others. The full list with the level and data source for each is above.

How many people does Fremont One serve?

Fremont One reports serving 39 people in California, per its EPA record.

Has Fremont One had any water quality violations?

The EPA has 22 violations on file for Fremont One, of which 22 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.