Tap WaterIndex

← California

Tap water quality report

Hesperia, CA

EPA monitoring detected 21 contaminants across the 2 water suppliers serving Hesperia. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
100,894
people served
21
contaminants found
California rankings Lead in California PFAS in California

What was found in Hesperia's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
832000 µg/L 8320%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2019
1/2 SYR4
Nitrate
2712 µg/L 27%
of the EPA limit 10000 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2019
Highest in the city: 3800 µg/L — CALICO LAKE HOMEOWNERS · 150 people · 2019
2/2 SYR4
Fluoride
664 µg/L 17%
of the EPA limit 4000 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2019
Highest in the city: 670 µg/L — CALICO LAKE HOMEOWNERS · 150 people · 2019
2/2 SYR4
Copper
170 µg/L 13%
of the EPA limit 1300 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2019
1/2 SYR4
Combined Uranium
3.427 µg/L 11%
of the EPA limit 30 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2015
Highest in the city: 28.906 µg/L — CALICO LAKE HOMEOWNERS · 150 people · 2017
2/2 SYR4
Chromium
20.45 µg/L 20%
of the EPA limit 100 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2019
2/2 SYR4
Lead
17 µg/L 113%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2019
1/2 SYR4
Lithium
10.2 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2025
1/2 UCMR-5
Arsenic
4.87 µg/L 49%
of the EPA limit 10 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2019
1/2 SYR4
Cadmium
4.7 µg/L 94%
of the EPA limit 5 µg/L
Highest in the city: CALICO LAKE HOMEOWNERS · 150 people · 2019
1/2 SYR4
Chloroform
4.25 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2019
1/2 SYR4
TTHM
3.9 µg/L 4.9%
of the EPA limit 80 µg/L
Main supplier: HESPERIA WD · 100,744 people · 2019
1/2 SYR4
Bromoform
2 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2019
1/2 SYR4
6:2 Fts
0.0503 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2025
1/2 UCMR-5
PFOS
0.0111 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2025
1/2 UCMR-5
PFHXS
0.0105 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2025
1/2 UCMR-5
PFOA
0.0102 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2025
1/2 UCMR-5
Pfhxa
0.0054 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2025
1/2 UCMR-5
Pfpea
0.0042 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2025
1/2 UCMR-5
Pfhpa
0.0031 µg/L
No EPA limit set
Main supplier: HESPERIA WD · 100,744 people · 2025
1/2 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: HESPERIA WD · 100,744 people · 2025
2/2 LCR
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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Hesperia

SupplierPopulation served
HESPERIA WD 100,744
CALICO LAKE HOMEOWNERS 150

Frequently asked questions about Hesperia tap water

Is Hesperia tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Hesperia. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Hesperia?

2 public water suppliers report drinking-water monitoring for Hesperia, California to the EPA. Each is listed above with its population served.

What contaminants are in Hesperia's water?

The contaminants EPA monitoring detected in Hesperia include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Combined Uranium. The full list, with the level at the main supplier and the data source, is in the table above.

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.