What was found in Marana'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 | 5675 µg/L 57% of the EPA limit 10000 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2019
Highest in the city: 9795 µg/L — GW SAGUARO DIST WATER CO - LYN LEE · 114 people · 2019 | 9/11 | SYR4 |
| Nitrate-Nitrite | 4572 µg/L 46% of the EPA limit 10000 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2017
Highest in the city: 8000 µg/L — GW SAGUARO DIST WATER CO - LYN LEE · 114 people · 2013 | 9/11 | SYR4 |
| Fluoride | 687 µg/L 17% of the EPA limit 4000 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2017 | 9/11 | SYR4 |
| Copper | 104.49999999999996 µg/L 8% of the EPA limit 1300 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2017
Highest in the city: 537 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2019 | 9/11 | SYR4 |
| Barium | 68.75 µg/L 3.4% of the EPA limit 2000 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2017
Highest in the city: 157.5 µg/L — MARANA DWID - DERRINGER · 1,950 people · 2018 | 9/11 | SYR4 |
| Lithium | 43.6 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2025
Highest in the city: 80 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2025 | 3/11 | UCMR-5 |
| TTHM | 11.54 µg/L 14% of the EPA limit 80 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2019
Highest in the city: 50.419999999999995 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2019 | 7/11 | SYR4 |
| Lead | 2.475 µg/L 17% of the EPA limit 15 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2017
Highest in the city: 25.599999999999937 µg/L — MARANA MUNICIPAL - AIRLINE LAMBERT · 4,568 people · 2018 | 9/11 | SYR4 |
| Combined Uranium | 20 µg/L 67% of the EPA limit 30 µg/L Highest in the city: MARANA MUNICIPAL - PALO VERDE · 118 people · 2015 | 1/11 | SYR4 |
| Bromoform | 1.1 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2019
Highest in the city: 19.7 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2019 | 5/11 | SYR4 |
| Dibromochloromethane | 1.1 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2019
Highest in the city: 15.885000000000002 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2019 | 4/11 | SYR4 |
| Total Haloacetic Acids (HAA5) | 2.42 µg/L 4% of the EPA limit 60 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2019
Highest in the city: 11.199999999999996 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2019 | 5/11 | SYR4 |
| Arsenic | 3.295 µg/L 33% of the EPA limit 10 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2017
Highest in the city: 6.225 µg/L — MARANA DWID - DERRINGER · 1,950 people · 2018 | 9/11 | SYR4 |
| Dibromoacetic Acid | 6.085 µg/L No EPA limit set Highest in the city: MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2019 | 3/11 | SYR4 |
| Bromodichloromethane | 5.38 µg/L No EPA limit set Highest in the city: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 3/11 | SYR4 |
| Chromium | 1.1 µg/L 1.1% of the EPA limit 100 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2017
Highest in the city: 4.225 µg/L — MARANA DWID - DERRINGER · 1,950 people · 2018 | 6/11 | SYR4 |
| Xylenes, Total | 2.125 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: MARANA MUNICIPAL - AIRLINE LAMBERT · 4,568 people · 2019 | 3/11 | SYR4 |
| Chloroform | 1.97 µg/L No EPA limit set Highest in the city: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 2/11 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.9 µg/L 32% of the EPA limit 6 µg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2019 | 5/11 | SYR4 |
| Dichloroacetic Acid | 1.57 µg/L No EPA limit set Highest in the city: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 2/11 | SYR4 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set Highest in the city: MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2019 | 1/11 | SYR4 |
| Vinyl Chloride | 1 µg/L 50% of the EPA limit 2 µg/L Highest in the city: MARANA DWID - DERRINGER · 1,950 people · 2019 | 1/11 | SYR4 |
| Combined Radium (-226 And -228) | 0.5000 pCi/L 10% of the EPA limit 5 pCi/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2018
Highest in the city: 0.7000 pCi/L — MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 3/11 | SYR4 |
| Chlorobenzene | 0.6000 µg/L 0.6% of the EPA limit 100 µg/L Highest in the city: MARANA MUNICIPAL - AIRLINE LAMBERT · 4,568 people · 2019 | 1/11 | SYR4 |
| Ethylbenzene | 0.5900 µg/L 0.1% of the EPA limit 700 µg/L Highest in the city: MARANA MUNICIPAL - AIRLINE LAMBERT · 4,568 people · 2019 | 1/11 | SYR4 |
| Simazine | 0.0598 µg/L 1.5% of the EPA limit 4 µg/L Highest in the city: MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2018 | 1/11 | SYR4 |
| Pfba | 0.0230 µg/L No EPA limit set Highest in the city: MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2025 | 1/11 | UCMR-5 |
| PFOS | 0.0179 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2025
Highest in the city: 0.0230 µg/L — MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2024 | 2/11 | UCMR-5 |
| PFHXS | 0.0207 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2025 | 2/11 | UCMR-5 |
| Pfpea | 0.0034 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2025
Highest in the city: 0.0160 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2025 | 2/11 | UCMR-5 |
| Pfhxa | 0.0039 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2025
Highest in the city: 0.0120 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2025 | 2/11 | UCMR-5 |
| PFBS | 0.0031 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2025
Highest in the city: 0.0078 µg/L — MARANA MUNICIPAL - PICTURE ROCKS · 5,278 people · 2025 | 2/11 | UCMR-5 |
| PFOA | 0.0063 µg/L No EPA limit set Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2025 | 1/11 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MARANA MUNICIPAL - MARANA · 15,162 people · 2023 | 11/11 | 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 Marana
| Supplier | Population served |
|---|---|
| MARANA MUNICIPAL - MARANA | 15,162 |
| MARANA MUNICIPAL - PICTURE ROCKS | 5,278 |
| MARANA MUNICIPAL - HARTMAN VISTAS | 5,248 |
| MARANA MUNICIPAL - AIRLINE LAMBERT | 4,568 |
| MARANA DWID - DERRINGER | 1,950 |
| MARANA MUNICIPAL - SILVERBELL GATEWAY | 750 |
| MARANA DWID - CULVER | 709 |
| MARANA MUNICIPAL - TORTOLITA MOUNTAIN | 200 |
| RANCHO TIERRA BLANCA POA | 126 |
| MARANA MUNICIPAL - PALO VERDE | 118 |
| GW SAGUARO DIST WATER CO - LYN LEE | 114 |
Frequently asked questions about Marana tap water
Is Marana tap water safe to drink?
EPA testing detected 34 contaminants in the water serving Marana. 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 Marana?
11 public water suppliers report drinking-water monitoring for Marana, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Marana's water?
The contaminants EPA monitoring detected in Marana include Nitrate, Nitrate-Nitrite, Fluoride, 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.