Tap WaterIndex

← California

Tap water quality report

Hi Desert Mwc

EPA monitoring tested this supplier for 41 contaminants and detected 6. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

41
contaminants tested
6
detected
112
people served
8
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.

8
health-based violations
28
violations on file
5
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2025-10-01 → 2025-12-31
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-04-01 → 2025-06-30
MCL Health-based Archived 2025-01-01 → 2025-03-31
TT Health-based Addressed 2024-10-17
MCL Health-based Archived 2024-10-01 → 2024-12-31
MCL Health-based Archived 2024-07-01 → 2024-09-30
Other Monitoring Addressed 2025-07-01
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 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
11 µg/L 110%
of the EPA limit, in the worst sample — 10 µg/L
 59/59 SYR4 2013–2019
Nitrate
1800 µg/L 18%
of the EPA limit 10000 µg/L
 34/38 SYR4 2013–2019
Fluoride
1300 µg/L 33%
of the EPA limit 4000 µg/L
 4/4 SYR4 2014–2018
Combined Uranium
22.499 µg/L 75%
of the EPA limit 30 µg/L
 3/3 SYR4 2016–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 3/3 LCR 2024
Nitrate-Nitrite
930000 µg/L 9300%
of the EPA limit, in the worst sample — 10000 µg/L
 3/4 SYR4 2014–2018
35 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalBariumBenzeneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneEthylene DibromideEthylbenzeneLeadMercuryNitriteSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BONKOWSKI, JULIE
Phone
760-220-5182
Email
juliebonkowskihdwc@gmail.com

Frequently asked questions about Hi Desert Mwc

Is Hi Desert Mwc tap water safe to drink?

EPA monitoring detected 6 contaminants in Hi Desert 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 Hi Desert Mwc's water?

EPA monitoring detected Arsenic, Nitrate, Fluoride, Combined Uranium, Lead, and others. The full list with the level and data source for each is above.

How many people does Hi Desert Mwc serve?

Hi Desert Mwc reports serving 112 people in California, per its EPA record.

Has Hi Desert Mwc had any water quality violations?

The EPA has 28 violations on file for Hi Desert Mwc, of which 8 are health-based (a contaminant limit or required treatment was breached) and 5 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.