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Tap water quality report

Hughson, CA

EPA monitoring detected 19 contaminants across the 2 water suppliers serving Hughson. 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
7,531
people served
19
contaminants found
California rankings Lead in California PFAS in California

What was found in Hughson'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
13243.6 µg/L 132%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
2/2 SYR4
Nitrate-Nitrite
9080 µg/L 91%
of the EPA limit 10000 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2018
2/2 SYR4
Fluoride
1262.5 µg/L 32%
of the EPA limit 4000 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2018
2/2 SYR4
Barium
261.735 µg/L 13%
of the EPA limit 2000 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2018
1/2 SYR4
Arsenic
13 µg/L 130%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
Highest in the city: 13.4 µg/L — COBLES CORNER · 50 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
4.655 µg/L 7.8%
of the EPA limit 60 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
1/2 SYR4
TTHM
4.042 µg/L 5.1%
of the EPA limit 80 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
1/2 SYR4
Bromoform
2.552 µg/L
No EPA limit set
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
1/2 SYR4
Dichloroacetic Acid
2.1 µg/L
No EPA limit set
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
1/2 SYR4
Chromium
2 µg/L 2%
of the EPA limit 100 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2018
1/2 SYR4
Dibromoacetic Acid
1.8 µg/L
No EPA limit set
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
1/2 SYR4
Trichloroacetic Acid
1.4 µg/L
No EPA limit set
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
1/2 SYR4
Dibromochloromethane
1.3435 µg/L
No EPA limit set
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
1/2 SYR4
Selenium
1.33 µg/L 2.7%
of the EPA limit 50 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2018
1/2 SYR4
Thallium, Total
0.7570 µg/L 38%
of the EPA limit 2 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2018
1/2 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.3760 µg/L 188%
of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2019
2/2 SYR4
Lead
0.2950 µg/L 2%
of the EPA limit 15 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2015
1/2 SYR4
Mercury
0.0480 µg/L 2.4%
of the EPA limit 2 µg/L
Main supplier: HUGHSON, CITY OF · 7,481 people · 2018
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: HUGHSON, CITY OF · 7,481 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 Hughson

SupplierPopulation served
HUGHSON, CITY OF 7,481
COBLES CORNER 50

Frequently asked questions about Hughson tap water

Is Hughson tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Hughson. 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 Hughson?

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

What contaminants are in Hughson's water?

The contaminants EPA monitoring detected in Hughson include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Arsenic. 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.