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San Joaquin Estates Mutual Water Company

EPA monitoring tested this supplier for 58 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

58
contaminants tested
12
detected
165
people served
73
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Kern

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.

73
health-based violations
106
violations on file
0
still open
ViolationTypeStatusPeriod
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 2024-07-01 → 2024-09-30
MCL Health-based Archived 2024-04-01 → 2024-06-30
MCL Health-based Archived 2024-04-01 → 2024-06-30
MCL Health-based Archived 2024-01-01 → 2024-03-31
MCL Health-based Archived 2024-01-01 → 2024-03-31

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
15142 µg/L 151%
of the EPA limit, in the worst sample — 10000 µg/L
 66/66 SYR4 2012–2019
Lead
0.00070 mg/L 4.7%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2024
Arsenic
8.7 µg/L 87%
of the EPA limit 10 µg/L
 5/5 SYR4 2013–2019
Barium
65 µg/L 3.3%
of the EPA limit 2000 µg/L
 5/5 SYR4 2013–2019
Fluoride
240 µg/L 6%
of the EPA limit 4000 µg/L
 5/5 SYR4 2013–2019
Selenium
17 µg/L 34%
of the EPA limit 50 µg/L
 5/5 SYR4 2013–2019
1,2-DIBROMO-3-CHLOROPROPANE
0.0890 µg/L 44%
of the EPA limit 0.2000 µg/L
 1/4 SYR4 2013–2019
Copper
190 µg/L 15%
of the EPA limit 1300 µg/L
 1/5 SYR4 2013–2019
Chromium
20 µg/L 20%
of the EPA limit 100 µg/L
 1/5 SYR4 2013–2019
Lead
39 µg/L 260%
of the EPA limit, in the worst sample — 15 µg/L
 1/5 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
2.5 µg/L 4.2%
of the EPA limit 60 µg/L
 1/1 SYR4 2016
Trichloroacetic Acid
2.5 µg/L
No EPA limit set
 1/1 SYR4 2016
46 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbon TetrachlorideChloroformDichloromethaneDalaponDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebEthylene DibromideEthylbenzeneLassoMercuryMonobromoacetic AcidMonochloroacetic AcidNitritePentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ARRINGTON, ALLEN
Phone
661-978-5876
Email
alangdon@mknassociates.us

Frequently asked questions about San Joaquin Estates Mutual Water Company

Is San Joaquin Estates Mutual Water Company tap water safe to drink?

EPA monitoring detected 12 contaminants in San Joaquin Estates Mutual Water Company'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 Estates Mutual Water Company's water?

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

How many people does San Joaquin Estates Mutual Water Company serve?

San Joaquin Estates Mutual Water Company reports serving 165 people in California, per its EPA record.

Has San Joaquin Estates Mutual Water Company had any water quality violations?

The EPA has 106 violations on file for San Joaquin Estates Mutual Water Company, of which 73 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.