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Tap water quality report

Tolas Waterworks Co Op

EPA monitoring tested this supplier for 78 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

78
contaminants tested
15
detected
190
people served
155
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Churchill

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.

155
health-based violations
565
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2015-04-01 → 2015-06-30
MCL Health-based Resolved 2015-04-01 → 2015-06-30
MCL Health-based Resolved 2015-04-01 → 2015-06-30
MCL Health-based Resolved 2015-04-01 → 2015-06-30
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2014-10-01 → 2014-12-31
MCL Health-based Resolved 2014-10-01 → 2014-12-31

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
Arsenic
140 µg/L 1400%
of the EPA limit, in the worst sample — 10 µg/L
 62/80 SYR4 2012–2019
Lead
0.0060 mg/L 40%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2025
Copper
230 µg/L 18%
of the EPA limit 1300 µg/L
 8/13 SYR4 2014–2019
Chloroform
3.9 µg/L
No EPA limit set
 6/8 SYR4 2012–2019
TTHM
5.7 µg/L 7.1%
of the EPA limit 80 µg/L
 6/8 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
4.3 µg/L 7.2%
of the EPA limit 60 µg/L
 6/8 SYR4 2012–2019
Bromodichloromethane
1.8 µg/L
No EPA limit set
 5/8 SYR4 2012–2019
Dichloroacetic Acid
3.2 µg/L
No EPA limit set
 5/8 SYR4 2012–2019
Trichloroacetic Acid
3.4 µg/L
No EPA limit set
 5/8 SYR4 2012–2019
Lead
220 µg/L 1467%
of the EPA limit, in the worst sample — 15 µg/L
 3/11 SYR4 2019
Fluoride
700 µg/L 18%
of the EPA limit 4000 µg/L
 2/2 SYR4 2014–2017
Chromium
2 µg/L 2%
of the EPA limit 100 µg/L
 1/2 SYR4 2014–2017
Dibromochloromethane
1 µg/L
No EPA limit set
 1/8 SYR4 2012–2019
Monobromoacetic Acid
1.2 µg/L
No EPA limit set
 1/8 SYR4 2012–2019
Xylenes, Total
0.0800 µg/L 0%
of the EPA limit 10000 µg/L
 1/4 SYR4 2012–2019
63 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNitrateNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HOPF, DAVE
Phone
626-688-1601
Email
DAVE.HOPF@ATT.NET

Frequently asked questions about Tolas Waterworks Co Op

Is Tolas Waterworks Co Op tap water safe to drink?

EPA monitoring detected 15 contaminants in Tolas Waterworks Co Op'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 Tolas Waterworks Co Op's water?

EPA monitoring detected Arsenic, Lead, Copper, Chloroform, TTHM, and others. The full list with the level and data source for each is above.

How many people does Tolas Waterworks Co Op serve?

Tolas Waterworks Co Op reports serving 190 people in California, per its EPA record.

Has Tolas Waterworks Co Op had any water quality violations?

The EPA has 565 violations on file for Tolas Waterworks Co Op, of which 155 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.