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

What was found in Martinez 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
Fluoride	3800 µg/L 95% of the EPA limit 4000 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2012	1/1	SYR4
Nitrate	3360 µg/L 34% of the EPA limit 10000 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2019	1/1	SYR4
Nitrate-Nitrite	3347 µg/L 33% of the EPA limit 10000 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2019	1/1	SYR4
Copper	252.4 µg/L 19% of the EPA limit 1300 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2019	1/1	SYR4
TTHM	63.215 µg/L 79% of the EPA limit 80 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2018	1/1	SYR4
Barium	24 µg/L 1.2% of the EPA limit 2000 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2012	1/1	SYR4
Lead	18 µg/L 120% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2019	1/1	SYR4
Arsenic	17.1 µg/L 171% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	14.15 µg/L 24% of the EPA limit 60 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2018	1/1	SYR4
Chromium	3.5 µg/L 3.5% of the EPA limit 100 µg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2012	1/1	SYR4
Combined Radium (-226 And -228)	0.8000 pCi/L 16% of the EPA limit 5 pCi/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2018	1/1	SYR4
Lead	0.0053 mg/L 35% of the EPA limit 0.0150 mg/L Main supplier: SHEPARD WATER COMPANY · 430 people · 2025	1/1	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 Martinez Lake

Supplier	Population served
SHEPARD WATER COMPANY	430

Frequently asked questions about Martinez Lake tap water

Is Martinez Lake tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Martinez 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 Martinez Lake?

1 public water supplier report drinking-water monitoring for Martinez Lake, Arizona to the EPA. Each is listed above with its population served.

What contaminants are in Martinez Lake's water?

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