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Tap water quality report

Muscoy Mwc No. 1

EPA monitoring tested this supplier for 82 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

82
contaminants tested
12
detected
13,000
people served
6
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
San Bernardino

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.

6
health-based violations
42
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2009-11-01 → 2009-11-30
MCL Health-based Resolved 2009-11-01 → 2009-11-30
MCL Health-based Resolved 1993-08-01 → 1993-08-31
MCL Health-based Resolved 1993-08-01 → 1993-08-31
MCL Health-based Resolved 1992-10-01 → 1992-10-31
MCL Health-based Resolved 1992-10-01 → 1992-10-31
MON Monitoring Resolved 2024-04-01 → 2024-04-30
MON Monitoring Resolved 2024-04-01 → 2024-04-30
MON Monitoring Resolved 2024-03-01 → 2024-03-31
MON Monitoring Resolved 2024-03-01 → 2024-03-31

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
Nitrate
3390 µg/L 34%
of the EPA limit 10000 µg/L
 80/80 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 24/24 LCR 2023
Fluoride
740 µg/L 19%
of the EPA limit 4000 µg/L
 15/15 SYR4 2012–2018
Nitrate-Nitrite
3200 µg/L 32%
of the EPA limit 10000 µg/L
 5/5 SYR4 2018
Bromodichloromethane
3.4 µg/L
No EPA limit set
 4/8 SYR4 2014–2019
Chloroform
3.1 µg/L
No EPA limit set
 4/8 SYR4 2014–2019
Dibromochloromethane
2.8 µg/L
No EPA limit set
 4/8 SYR4 2014–2019
TTHM
9.1 µg/L 11%
of the EPA limit 80 µg/L
 4/8 SYR4 2014–2019
Bromoform
1.3 µg/L
No EPA limit set
 2/8 SYR4 2014–2019
Combined Uranium
4.619 µg/L 15%
of the EPA limit 30 µg/L
 2/2 SYR4 2017
Dichloroacetic Acid
1 µg/L
No EPA limit set
 1/8 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
1 µg/L 1.7%
of the EPA limit 60 µg/L
 1/8 SYR4 2014–2019
70 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, TotalArsenicBariumBenzeneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneDibromoacetic AcidEthylene DibromideEthylbenzeneHfpo-DaLeadMercuryMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
GARCIA, RUDY
Phone
909-887-2964
Email
RGARCIA.MMWC@VERIZON.NET

Frequently asked questions about Muscoy Mwc No. 1

Is Muscoy Mwc No. 1 tap water safe to drink?

EPA monitoring detected 12 contaminants in Muscoy Mwc No. 1'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 Muscoy Mwc No. 1's water?

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

How many people does Muscoy Mwc No. 1 serve?

Muscoy Mwc No. 1 reports serving 13,000 people in California, per its EPA record.

Has Muscoy Mwc No. 1 had any water quality violations?

The EPA has 42 violations on file for Muscoy Mwc No. 1, of which 6 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.