Is Douglas, AZ Tap Water Safe? Quality & Contaminants

What was found in Douglas'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	1830 µg/L 18% of the EPA limit 10000 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019 Highest in the city: 4700 µg/L — COCHISE COLLEGE PARK WATER ASSOC · 83 people · 2019	5/5	SYR4
Nitrate-Nitrite	1785 µg/L 18% of the EPA limit 10000 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019 Highest in the city: 3000 µg/L — COCHISE COLLEGE PARK WATER ASSOC · 83 people · 2012	3/5	SYR4
Fluoride	530 µg/L 13% of the EPA limit 4000 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019 Highest in the city: 1752.5 µg/L — MONTE VISTA WATER COMPANY · 150 people · 2017	5/5	SYR4
Lithium	152 µg/L No EPA limit set Main supplier: DOUGLAS CITY OF · 16,656 people · 2025	1/5	UCMR-5
Copper	87 µg/L 6.7% of the EPA limit 1300 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019 Highest in the city: 140.7 µg/L — TWIN BUTTES RV, LLC · 79 people · 2019	5/5	SYR4
Barium	102.5 µg/L 5.1% of the EPA limit 2000 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019 Highest in the city: 120 µg/L — LA COSTA WATER USERS ASSOC · 30 people · 2014	5/5	SYR4
TTHM	12.05 µg/L 15% of the EPA limit 80 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	3/5	SYR4
Arsenic	7.1 µg/L 71% of the EPA limit 10 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019 Highest in the city: 11 µg/L — MONTE VISTA WATER COMPANY · 150 people · 2019	5/5	SYR4
Total Haloacetic Acids (HAA5)	3.04 µg/L 5.1% of the EPA limit 60 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019 Highest in the city: 6.41 µg/L — MONTE VISTA WATER COMPANY · 150 people · 2019	3/5	SYR4
Bromoform	6.05 µg/L No EPA limit set Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	1/5	SYR4
Chromium	6 µg/L 6% of the EPA limit 100 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	2/5	SYR4
Lead	4.61 µg/L 31% of the EPA limit 15 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	4/5	SYR4
Selenium	3.8 µg/L 7.6% of the EPA limit 50 µg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	1/5	SYR4
Dibromochloromethane	3.56 µg/L No EPA limit set Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	1/5	SYR4
Combined Radium (-226 And -228)	1.555 pCi/L 31% of the EPA limit 5 pCi/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	1/5	SYR4
Bromodichloromethane	1.465 µg/L No EPA limit set Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	1/5	SYR4
Dibromoacetic Acid	1.28 µg/L No EPA limit set Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	1/5	SYR4
Chloroform	0.6000 µg/L No EPA limit set Main supplier: DOUGLAS CITY OF · 16,656 people · 2019	1/5	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: DOUGLAS CITY OF · 16,656 people · 2025 Highest in the city: 0.0150 mg/L — TWIN BUTTES RV, LLC · 79 people · 2025	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 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 Douglas

Supplier	Population served
DOUGLAS CITY OF	16,656
MONTE VISTA WATER COMPANY	150
COCHISE COLLEGE PARK WATER ASSOC	83
TWIN BUTTES RV, LLC	79
LA COSTA WATER USERS ASSOC	30

Frequently asked questions about Douglas tap water

Is Douglas tap water safe to drink?

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

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

What contaminants are in Douglas's water?

The contaminants EPA monitoring detected in Douglas include Nitrate, Nitrate-Nitrite, Fluoride, Lithium, Copper. 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.