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Tap water quality report

Pima, AZ

EPA monitoring detected 16 contaminants across the 3 water suppliers serving Pima. 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.

3
water suppliers
4,561
people served
16
contaminants found
Arizona rankings Lead in Arizona PFAS in Arizona

What was found in Pima'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
4525 µg/L 45%
of the EPA limit 10000 µg/L
Highest in the city: GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
2/3 SYR4
Fluoride
1280 µg/L 32%
of the EPA limit 4000 µg/L
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2018
Highest in the city: 2000 µg/L — ASH CREEK WATER COMPANY · 310 people · 2013
3/3 SYR4
Nitrate-Nitrite
994.5 µg/L 9.9%
of the EPA limit 10000 µg/L
Highest in the city: GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2016
1/3 SYR4
Copper
18.3 µg/L 1.4%
of the EPA limit 1300 µg/L
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2018
Highest in the city: 449.5 µg/L — GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2017
3/3 SYR4
Barium
15.6 µg/L 0.8%
of the EPA limit 2000 µg/L
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2018
Highest in the city: 38.7 µg/L — GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
3/3 SYR4
Lead
1.285 µg/L 8.6%
of the EPA limit 15 µg/L
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2018
Highest in the city: 18.13 µg/L — ASH CREEK WATER COMPANY · 310 people · 2017
3/3 SYR4
TTHM
5.565 µg/L 7%
of the EPA limit 80 µg/L
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2019
Highest in the city: 15.36 µg/L — GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
2/3 SYR4
Arsenic
9.64 µg/L 96%
of the EPA limit 10 µg/L
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2018
3/3 SYR4
Bromoform
3.675 µg/L
No EPA limit set
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2019
Highest in the city: 7.8 µg/L — GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
2/3 SYR4
Chromium
4.97 µg/L 5%
of the EPA limit 100 µg/L
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2018
2/3 SYR4
Dibromochloromethane
0.8950 µg/L
No EPA limit set
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2019
Highest in the city: 2.8 µg/L — GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
2/3 SYR4
Total Haloacetic Acids (HAA5)
2.57 µg/L 4.3%
of the EPA limit 60 µg/L
Highest in the city: GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
1/3 SYR4
Dibromoacetic Acid
2.3 µg/L
No EPA limit set
Highest in the city: GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
1/3 SYR4
Bromodichloromethane
0.7000 µg/L
No EPA limit set
Highest in the city: GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
1/3 SYR4
Combined Radium (-226 And -228)
0.6000 pCi/L 12%
of the EPA limit 5 pCi/L
Highest in the city: GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2019
1/3 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: GRAHAM COUNTY UTILITIES - PIMA · 3,799 people · 2024
Highest in the city: 0.0320 mg/L — GRAHAM COUNTY UTILITIES-FORT THOMAS · 452 people · 2027
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 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 Pima

SupplierPopulation served
GRAHAM COUNTY UTILITIES - PIMA 3,799
GRAHAM COUNTY UTILITIES-FORT THOMAS 452
ASH CREEK WATER COMPANY 310

Frequently asked questions about Pima tap water

Is Pima tap water safe to drink?

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

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

What contaminants are in Pima's water?

The contaminants EPA monitoring detected in Pima include Nitrate, Fluoride, Nitrate-Nitrite, Copper, Barium. 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.