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Tap water quality report

Cal Am - Oakhurst

EPA monitoring tested this supplier for 85 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

85
contaminants tested
17
detected
3,693
people served
221
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Madera

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.

221
health-based violations
227
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2019-01-01 → 2019-03-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-07-01 → 2018-09-30
MCL Health-based Resolved 2018-07-01 → 2018-09-30

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Combined Uranium
309.92 µg/L 1033%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
worst single sample: 551.3 µg/L
405/409 SYR4 2012–2019
Arsenic
30 µg/L 300%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 120 µg/L
196/226 SYR4 2012–2019
Nitrate
3430 µg/L 34%
of the EPA limit 10000 µg/L
worst single sample: 7200 µg/L
68/294 SYR4 2012–2019
Fluoride
607.5 µg/L 15%
of the EPA limit 4000 µg/L
worst single sample: 680 µg/L
42/45 SYR4 2012–2019
Tetrachloroethylene
7.7 µg/L 154%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 8.2 µg/L
41/114 SYR4 2012–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2025
Nitrate-Nitrite
630000 µg/L 6300%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 680000 µg/L
11/30 SYR4 2013–2019
Lithium
474 µg/L
No EPA limit set
 8/8 UCMR-5 2023
Toluene
130.5 µg/L 13%
of the EPA limit 1000 µg/L
worst single sample: 180 µg/L
7/113 SYR4 2012–2019
TTHM
9.425 µg/L 12%
of the EPA limit 80 µg/L
worst single sample: 9.9 µg/L
6/6 SYR4 2014–2019
Dibromochloromethane
3.665 µg/L
No EPA limit set
worst single sample: 3.8 µg/L
4/6 SYR4 2014–2019
Bromodichloromethane
3.14 µg/L
No EPA limit set
worst single sample: 3.2 µg/L
3/6 SYR4 2014–2019
Chloroform
1.98 µg/L
No EPA limit set
worst single sample: 2 µg/L
3/6 SYR4 2014–2019
Selenium
8.44 µg/L 17%
of the EPA limit 50 µg/L
worst single sample: 8.6 µg/L
3/42 SYR4 2012–2019
Dibromoacetic Acid
1.095 µg/L
No EPA limit set
worst single sample: 1.1 µg/L
2/5 SYR4 2015–2019
Copper
60 µg/L 4.6%
of the EPA limit 1300 µg/L
 1/37 SYR4 2012–2018
Cadmium
1 µg/L 20%
of the EPA limit 5 µg/L
 1/42 SYR4 2012–2019
68 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBariumBenzeneBeryllium, TotalBromoformChlorobenzeneCarbon TetrachlorideChromiumDichloromethaneDichloroacetic AcidEthylene DibromideEthylbenzeneHfpo-DaLassoLeadMercuryMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSimazineStyreneThallium, TotalTotal Haloacetic Acids (HAA5)Trichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
FOSTER, AUDIE
Phone
916-568-4259
Email
audie.foster@amwater.com

Frequently asked questions about Cal Am - Oakhurst

Is Cal Am - Oakhurst tap water safe to drink?

EPA monitoring detected 17 contaminants in Cal Am - Oakhurst'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 Cal Am - Oakhurst's water?

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

How many people does Cal Am - Oakhurst serve?

Cal Am - Oakhurst reports serving 3,693 people in California, per its EPA record.

Has Cal Am - Oakhurst had any water quality violations?

The EPA has 227 violations on file for Cal Am - Oakhurst, of which 221 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.