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Tap water quality report

Ione, CA

EPA monitoring detected 12 contaminants across the 2 water suppliers serving Ione. 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
3,774
people served
12
contaminants found
California rankings Lead in California PFAS in California

What was found in Ione'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
100000 µg/L 1000%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Nitrate
632.8 µg/L 6.3%
of the EPA limit 10000 µg/L
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Fluoride
109.5 µg/L 2.7%
of the EPA limit 4000 µg/L
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
46.86 µg/L 78%
of the EPA limit 60 µg/L
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
TTHM
42.211999999999996 µg/L 53%
of the EPA limit 80 µg/L
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Chloroform
40.867999999999995 µg/L
No EPA limit set
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Trichloroacetic Acid
25.66 µg/L
No EPA limit set
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Dichloroacetic Acid
22.1 µg/L
No EPA limit set
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Arsenic
4.2 µg/L 42%
of the EPA limit 10 µg/L
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Bromodichloromethane
3.2279999999999998 µg/L
No EPA limit set
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Monochloroacetic Acid
3.08 µg/L
No EPA limit set
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2019
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: JACKSON VALLEY IRRIGATION DISTRICT · 3,553 people · 2023
Highest in the city: 0.0027 mg/L — DRYTOWN COUNTY WATER DISTRICT · 221 people · 2027
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 Ione

SupplierPopulation served
JACKSON VALLEY IRRIGATION DISTRICT 3,553
DRYTOWN COUNTY WATER DISTRICT 221

Frequently asked questions about Ione tap water

Is Ione tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Ione. 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 Ione?

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

What contaminants are in Ione's water?

The contaminants EPA monitoring detected in Ione include Nitrate-Nitrite, Nitrate, Fluoride, Total Haloacetic Acids (HAA5), TTHM. 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.