Is Mormon Lake, AZ Tap Water Safe? Quality & Contaminants

What was found in Mormon Lake'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	2220 µg/L 22% of the EPA limit 10000 µg/L Main supplier: CS MORMON LAKE WATER COMPANY · 353 people · 2019	2/2	SYR4
Nitrate-Nitrite	460 µg/L 4.6% of the EPA limit 10000 µg/L Main supplier: CS MORMON LAKE WATER COMPANY · 353 people · 2019 Highest in the city: 1382 µg/L — TALL PINES ESTATES WATER · 156 people · 2014	2/2	SYR4
Copper	526 µg/L 40% of the EPA limit 1300 µg/L Main supplier: CS MORMON LAKE WATER COMPANY · 353 people · 2012 Highest in the city: 883.1 µg/L — TALL PINES ESTATES WATER · 156 people · 2019	2/2	SYR4
Fluoride	166.05 µg/L 4.2% of the EPA limit 4000 µg/L Highest in the city: TALL PINES ESTATES WATER · 156 people · 2013	1/2	SYR4
Barium	73.45 µg/L 3.7% of the EPA limit 2000 µg/L Highest in the city: TALL PINES ESTATES WATER · 156 people · 2013	1/2	SYR4
Lead	12.8 µg/L 85% of the EPA limit 15 µg/L Main supplier: CS MORMON LAKE WATER COMPANY · 353 people · 2012	2/2	SYR4
TTHM	5 µg/L 6.3% of the EPA limit 80 µg/L Main supplier: CS MORMON LAKE WATER COMPANY · 353 people · 2012	1/2	SYR4
Arsenic	3.885 µg/L 39% of the EPA limit 10 µg/L Highest in the city: TALL PINES ESTATES WATER · 156 people · 2013	1/2	SYR4
Lead	0.0080 mg/L 53% of the EPA limit 0.0150 mg/L Main supplier: CS MORMON LAKE WATER COMPANY · 353 people · 2012	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 Mormon Lake

Supplier	Population served
CS MORMON LAKE WATER COMPANY	353
TALL PINES ESTATES WATER	156

Frequently asked questions about Mormon Lake tap water

Is Mormon Lake tap water safe to drink?

EPA testing detected 9 contaminants in the water serving Mormon Lake. 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 Mormon Lake?

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

What contaminants are in Mormon Lake's water?

The contaminants EPA monitoring detected in Mormon Lake include Nitrate, Nitrate-Nitrite, Copper, Fluoride, 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.