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Tap water quality report

Sonoita, AZ

EPA monitoring detected 16 contaminants across the 3 water suppliers serving Sonoita. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
245
people served
16
contaminants found
Arizona rankings Lead in Arizona PFAS in Arizona

What was found in Sonoita's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
2200 µg/L 22%
of the EPA limit 10000 µg/L
 3/3 SYR4
Nitrate-Nitrite
2200 µg/L 22%
of the EPA limit 10000 µg/L
 2/3 SYR4
Copper
510 µg/L 39%
of the EPA limit 1300 µg/L
 3/3 SYR4
Barium
440 µg/L 22%
of the EPA limit 2000 µg/L
 3/3 SYR4
Fluoride
370 µg/L 9.3%
of the EPA limit 4000 µg/L
 3/3 SYR4
Gross Alpha, Excl. Radon And U
93 pCi/L 620%
of the EPA limit, in the worst sample — 15 pCi/L
 1/3 SYR4
Combined Uranium
44.9 µg/L 150%
of the EPA limit, in the worst sample — 30 µg/L
 1/3 SYR4
TTHM
12 µg/L 15%
of the EPA limit 80 µg/L
 3/3 SYR4
Lead
6.5 µg/L 43%
of the EPA limit 15 µg/L
 3/3 SYR4
Arsenic
5.5 µg/L 55%
of the EPA limit 10 µg/L
 3/3 SYR4
Total Haloacetic Acids (HAA5)
5 µg/L 8.3%
of the EPA limit 60 µg/L
 1/3 SYR4
Trichloroacetic Acid
5 µg/L
No EPA limit set
 1/3 SYR4
Combined Radium (-226 And -228)
1.2 pCi/L 24%
of the EPA limit 5 pCi/L
 2/3 SYR4
Bromoform
0.6000 µg/L
No EPA limit set
 1/3 SYR4
Dibromochloromethane
0.6000 µg/L
No EPA limit set
 1/3 SYR4
Lead
0.0080 mg/L 53%
of the EPA limit 0.0150 mg/L
 3/3 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 single worst sample on record — 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 Sonoita

SupplierPopulation served
SONOITA VALLEY (SOUTH) WATER COMPANY 169
SONOITA VALLEY (NORTH) WATER COMPANY 49
CASAS ARROYO ASSOCIATION INC 27

Frequently asked questions about Sonoita tap water

Is Sonoita tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Sonoita. 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 Sonoita?

3 public water suppliers report drinking-water monitoring for Sonoita, Arizona to the EPA. Each is listed above with its population served.

What contaminants are in Sonoita's water?

The contaminants EPA monitoring detected in Sonoita include Nitrate, Nitrate-Nitrite, Copper, Barium, Fluoride. The full list, with the highest level found 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.