Tap WaterIndex

← California

Tap water quality report

Union Heights Mwc

EPA monitoring tested this supplier for 79 contaminants and detected 4. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

79
contaminants tested
4
detected
98
people served
8
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
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.

8
health-based violations
25
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2003-07-01 → 2003-08-31
MCL Health-based Resolved 2003-07-01 → 2003-08-31
MCL Health-based Resolved 2002-05-01 → 2002-05-31
MCL Health-based Resolved 2002-05-01 → 2002-05-31
MCL Health-based Resolved 1999-10-01 → 1999-12-31
MCL Health-based Resolved 1999-10-01 → 1999-12-31
MCL Health-based Resolved 1999-07-01 → 1999-09-30
MCL Health-based Resolved 1999-07-01 → 1999-09-30
MR Monitoring Resolved 2009-01-01 → 2009-12-31
MR Monitoring Resolved 2009-01-01 → 2009-12-31

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
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2024
Nitrate
1491.6 µg/L 15%
of the EPA limit 10000 µg/L
 6/32 SYR4 2012–2019
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
 1/4 SYR4 2012–2018
Nitrate-Nitrite
1200 µg/L 12%
of the EPA limit 10000 µg/L
 1/3 SYR4 2017–2019
75 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, TotalArsenicAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ASH, JOHN
Phone
408-592-7884
Email
jash1967@gmail.com

Frequently asked questions about Union Heights Mwc

Is Union Heights Mwc tap water safe to drink?

EPA monitoring detected 4 contaminants in Union Heights Mwc'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 Union Heights Mwc's water?

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

How many people does Union Heights Mwc serve?

Union Heights Mwc reports serving 98 people in California, per its EPA record.

Has Union Heights Mwc had any water quality violations?

The EPA has 25 violations on file for Union Heights Mwc, of which 8 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.