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Tap water quality report

Nogales, AZ

EPA monitoring detected 20 contaminants across the 5 water suppliers serving Nogales. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

5
water suppliers
25,023
people served
20
contaminants found
Arizona rankings Lead in Arizona PFAS in Arizona

What was found in Nogales'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
7100 µg/L 71%
of the EPA limit 10000 µg/L
 5/5 SYR4
Nitrate-Nitrite
6630 µg/L 66%
of the EPA limit 10000 µg/L
 5/5 SYR4
Fluoride
3000 µg/L 75%
of the EPA limit 4000 µg/L
 5/5 SYR4
Copper
1610 µg/L 124%
of the EPA limit, in the worst sample — 1300 µg/L
 5/5 SYR4
Barium
260 µg/L 13%
of the EPA limit 2000 µg/L
 4/5 SYR4
Lithium
57.4 µg/L
No EPA limit set
 1/5 UCMR-5
TTHM
51 µg/L 64%
of the EPA limit 80 µg/L
 5/5 SYR4
Combined Uranium
24.4 µg/L 81%
of the EPA limit 30 µg/L
 3/5 SYR4
Asbestos
23.5 MFL 336%
of the EPA limit, in the worst sample — 7 MFL
 1/5 SYR4
Arsenic
13 µg/L 130%
of the EPA limit, in the worst sample — 10 µg/L
 5/5 SYR4
Lead
10 µg/L 67%
of the EPA limit 15 µg/L
 5/5 SYR4
Bromoform
5.4 µg/L
No EPA limit set
 1/5 SYR4
Gross Alpha, Excl. Radon And U
4.9 pCi/L 33%
of the EPA limit 15 pCi/L
 2/5 SYR4
Total Haloacetic Acids (HAA5)
3.9 µg/L 6.5%
of the EPA limit 60 µg/L
 3/5 SYR4
Dibromochloromethane
3.4 µg/L
No EPA limit set
 1/5 SYR4
Dibromoacetic Acid
2 µg/L
No EPA limit set
 1/5 SYR4
Trichloroethylene
1.8 µg/L 36%
of the EPA limit 5 µg/L
 1/5 SYR4
Bromodichloromethane
1.1 µg/L
No EPA limit set
 1/5 SYR4
Tetrachloroethylene
0.7200 µg/L 14%
of the EPA limit 5 µg/L
 3/5 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 5/5 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 Nogales

SupplierPopulation served
NOGALES CITY OF 22,000
VALLE VERDE WATER COMPANY - EAST 2,331
TOWN & COUNTRY - PRESTON 430
THE GRAND ACRES 153
KINO RANCH 2 109

Frequently asked questions about Nogales tap water

Is Nogales tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Nogales. 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 Nogales?

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

What contaminants are in Nogales's water?

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