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Tap water quality report

Joshua Basin Water District

EPA monitoring tested this supplier for 83 contaminants and detected 14. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

83
contaminants tested
14
detected
6,640
people served
6
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
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
6
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2003-09-01 → 2003-09-30
MCL Health-based Resolved 2003-09-01 → 2003-09-30
MCL Health-based Resolved 2003-05-01 → 2003-05-31
MCL Health-based Resolved 2003-05-01 → 2003-05-31
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-06-01 → 1999-06-30

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
6000 µg/L 60%
of the EPA limit 10000 µg/L
worst single sample: 6200 µg/L
188/188 SYR4 2012–2019
Lead
0.0110 mg/L 73%
of the EPA limit 0.0150 mg/L
 29/29 LCR 2025
Fluoride
1000 µg/L 25%
of the EPA limit 4000 µg/L
 20/20 SYR4 2012–2019
Chromium
39.4 µg/L 39%
of the EPA limit 100 µg/L
worst single sample: 41 µg/L
17/20 SYR4 2012–2019
Dibromochloromethane
6.65 µg/L
No EPA limit set
worst single sample: 6.9 µg/L
11/12 SYR4 2014–2019
TTHM
17.05 µg/L 21%
of the EPA limit 80 µg/L
worst single sample: 17.6 µg/L
11/12 SYR4 2014–2019
Bromoform
6.915 µg/L
No EPA limit set
worst single sample: 7.5 µg/L
10/12 SYR4 2014–2019
Nitrate-Nitrite
5855 µg/L 59%
of the EPA limit 10000 µg/L
worst single sample: 6100 µg/L
8/8 SYR4 2016–2019
Bromodichloromethane
2.975 µg/L
No EPA limit set
worst single sample: 3.1 µg/L
6/12 SYR4 2014–2019
Arsenic
5.46 µg/L 55%
of the EPA limit 10 µg/L
worst single sample: 5.5 µg/L
5/15 SYR4 2012–2019
Chloroform
1.355 µg/L
No EPA limit set
worst single sample: 1.4 µg/L
4/12 SYR4 2014–2019
Dibromoacetic Acid
1.555 µg/L
No EPA limit set
worst single sample: 1.6 µg/L
4/12 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
1.555 µg/L 2.6%
of the EPA limit 60 µg/L
worst single sample: 1.6 µg/L
4/12 SYR4 2014–2019
Lithium
13.7 µg/L
No EPA limit set
 3/9 UCMR-5 2025
69 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalBariumBenzeneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideCombined UraniumDichloromethaneDichloroacetic AcidEthylene DibromideEthylbenzeneHfpo-DaLeadMercuryMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
JOHNSON, SARAH
Phone
760-366-8438
Email
[email protected]

Frequently asked questions about Joshua Basin Water District

Is Joshua Basin Water District tap water safe to drink?

EPA monitoring detected 14 contaminants in Joshua Basin Water District'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 Joshua Basin Water District's water?

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

How many people does Joshua Basin Water District serve?

Joshua Basin Water District reports serving 6,640 people in California, per its EPA record.

Has Joshua Basin Water District had any water quality violations?

The EPA has 6 violations on file for Joshua Basin Water District, 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.