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Tap water quality report

Csa No. 31 Stonegate Ws

EPA monitoring tested this supplier for 80 contaminants and detected 22. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

80
contaminants tested
22
detected
230
people served
25
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface water
Ownership
Local government
Counties served
San Benito

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.

25
health-based violations
30
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Archived 2022-04-01 → 2022-06-30
MCL Health-based Resolved 2009-10-01 → 2009-12-31
MCL Health-based Resolved 2009-10-01 → 2009-12-31
MCL Health-based Resolved 2009-07-01 → 2009-09-30
MCL Health-based Resolved 2009-07-01 → 2009-09-30
MCL Health-based Resolved 2009-04-01 → 2009-06-30
MCL Health-based Resolved 2009-04-01 → 2009-06-30
MCL Health-based Resolved 2006-04-01 → 2006-06-30
MCL Health-based Resolved 2006-04-01 → 2006-06-30
TT Health-based Resolved 2006-04-01 → 2006-06-30

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 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
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 28/28 LCR 2023
Total Haloacetic Acids (HAA5)
35.4 µg/L 59%
of the EPA limit 60 µg/L
 13/25 SYR4 2014–2019
Dibromoacetic Acid
21.1 µg/L
No EPA limit set
 12/25 SYR4 2014–2019
TTHM
161.8 µg/L 202%
of the EPA limit, in the worst sample — 80 µg/L
 12/26 SYR4 2014–2019
Nitrate
980 µg/L 9.8%
of the EPA limit 10000 µg/L
 10/40 SYR4 2012–2019
Bromoform
56.25 µg/L
No EPA limit set
 9/26 SYR4 2014–2019
Dibromochloromethane
68 µg/L
No EPA limit set
 9/26 SYR4 2014–2019
Dichloroacetic Acid
12.2 µg/L
No EPA limit set
 9/25 SYR4 2014–2019
Trichloroacetic Acid
5.4 µg/L
No EPA limit set
 9/25 SYR4 2014–2019
Fluoride
400 µg/L 10%
of the EPA limit 4000 µg/L
 8/12 SYR4 2012–2019
Arsenic
4.4 µg/L 44%
of the EPA limit 10 µg/L
 6/12 SYR4 2012–2019
Chloroform
9.15 µg/L
No EPA limit set
 6/26 SYR4 2014–2019
Bromodichloromethane
34.37 µg/L
No EPA limit set
 5/26 SYR4 2014–2019
Combined Uranium
3.874 µg/L 13%
of the EPA limit 30 µg/L
 4/4 SYR4 2013–2014
Monobromoacetic Acid
3 µg/L
No EPA limit set
 4/25 SYR4 2014–2019
Nitrate-Nitrite
700000 µg/L 7000%
of the EPA limit, in the worst sample — 10000 µg/L
 4/9 SYR4 2013–2019
Selenium
7.4 µg/L 15%
of the EPA limit 50 µg/L
 3/12 SYR4 2012–2019
Barium
107 µg/L 5.4%
of the EPA limit 2000 µg/L
 1/12 SYR4 2012–2019
Chromium
2.1 µg/L 2.1%
of the EPA limit 100 µg/L
 1/12 SYR4 2012–2019
Combined Radium (-226 And -228)
1.75 pCi/L 35%
of the EPA limit 5 pCi/L
 1/1 SYR4 2014
Monochloroacetic Acid
4.5 µg/L
No EPA limit set
 1/25 SYR4 2014–2019
Toluene
0.7800 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/6 SYR4 2013–2017
58 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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
YOUNG, LINDA
Phone
831-636-4170
Email
liyoung@sanbenitocountyca.gov

Frequently asked questions about Csa No. 31 Stonegate Ws

Is Csa No. 31 Stonegate Ws tap water safe to drink?

EPA monitoring detected 22 contaminants in Csa No. 31 Stonegate Ws'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 Csa No. 31 Stonegate Ws's water?

EPA monitoring detected Lead, Total Haloacetic Acids (HAA5), Dibromoacetic Acid, TTHM, Nitrate, and others. The full list with the level and data source for each is above.

How many people does Csa No. 31 Stonegate Ws serve?

Csa No. 31 Stonegate Ws reports serving 230 people in California, per its EPA record.

Has Csa No. 31 Stonegate Ws had any water quality violations?

The EPA has 30 violations on file for Csa No. 31 Stonegate Ws, of which 25 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.