Tap WaterIndex

← California

Tap water quality report

Oakdale, City of

EPA monitoring tested this supplier for 111 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

111
contaminants tested
11
detected
23,235
people served
9
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
Counties served
Stanislaus

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.

9
health-based violations
15
violations on file
2
still open
ViolationTypeStatusPeriod
TT Health-based Addressed 2024-10-17
MCL Health-based Resolved 2009-08-01 → 2009-08-31
MCL Health-based Resolved 2009-08-01 → 2009-08-31
MCL Health-based Resolved 2005-01-01 → 2005-01-31
MCL Health-based Resolved 2005-01-01 → 2005-01-31
MCL Health-based Resolved 1995-11-01 → 1995-11-30
MCL Health-based Resolved 1995-11-01 → 1995-11-30
MCL Health-based Resolved 1995-07-01 → 1995-07-31
MCL Health-based Resolved 1995-07-01 → 1995-07-31
RPT Monitoring Addressed 2024-10-17

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
Nitrate
6435.35 µg/L 64%
of the EPA limit 10000 µg/L
worst single sample: 8249 µg/L
142/142 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 31/31 LCR 2025
Nitrate-Nitrite
176560 µg/L 1766%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 860000 µg/L
17/17 SYR4 2012–2019
Barium
148 µg/L 7.4%
of the EPA limit 2000 µg/L
worst single sample: 160 µg/L
13/25 SYR4 2012–2019
Tetrachloroethylene
4.44 µg/L 89%
of the EPA limit 5 µg/L
worst single sample: 4.8 µg/L
13/40 SYR4 2012–2019
TTHM
2.75 µg/L 3.4%
of the EPA limit 80 µg/L
worst single sample: 3.3 µg/L
12/39 SYR4 2013–2019
Arsenic
2.875 µg/L 29%
of the EPA limit 10 µg/L
worst single sample: 3.1 µg/L
10/25 SYR4 2012–2019
Bromoform
1.485 µg/L
No EPA limit set
worst single sample: 1.5 µg/L
2/39 SYR4 2013–2019
Combined Uranium
2.34675 µg/L 7.8%
of the EPA limit 30 µg/L
worst single sample: 2.384 µg/L
2/4 SYR4 2015–2019
Dibromochloromethane
1.195 µg/L
No EPA limit set
worst single sample: 1.2 µg/L
2/39 SYR4 2013–2019
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
 1/25 SYR4 2012–2019
100 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ROBERTS, JEFF
Phone
209-845-3600
Email
jroberts@oakdaleca.gov

Frequently asked questions about Oakdale, City of

Is Oakdale, City of tap water safe to drink?

EPA monitoring detected 11 contaminants in Oakdale, City of'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 Oakdale, City of's water?

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

How many people does Oakdale, City of serve?

Oakdale, City of reports serving 23,235 people in California, per its EPA record.

Has Oakdale, City of had any water quality violations?

The EPA has 15 violations on file for Oakdale, City of, of which 9 are health-based (a contaminant limit or required treatment was breached) and 2 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.