What was found in Show Low'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 |
|---|---|---|---|
| Selenium | 39.15 µg/L 78% of the EPA limit 50 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 1434 µg/L — PINEDALE ESTATES DWID · 208 people · 2019 | 6/10 | SYR4 |
| Nitrate | 210 µg/L 2.1% of the EPA limit 10000 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 1400 µg/L — COUNTRY LANE TRAILER PARK · 450 people · 2019 | 6/10 | SYR4 |
| Nitrate-Nitrite | 201 µg/L 2% of the EPA limit 10000 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 1325 µg/L — ARIZONA WATER CO - LAKESIDE · 12,191 people · 2018 | 4/10 | SYR4 |
| Copper | 444.8 µg/L 34% of the EPA limit 1300 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 490 µg/L — PINEDALE ESTATES DWID · 208 people · 2019 | 9/10 | SYR4 |
| Fluoride | 171 µg/L 4.3% of the EPA limit 4000 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 260 µg/L — PINEDALE ESTATES DWID · 208 people · 2019 | 8/10 | SYR4 |
| Barium | 70 µg/L 3.5% of the EPA limit 2000 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 230 µg/L — ARIZONA WATER CO - LAKESIDE · 12,191 people · 2015 | 8/10 | SYR4 |
| Lithium | 18.4 µg/L No EPA limit set Main supplier: CITY OF SHOW LOW · 17,139 people · 2024
Highest in the city: 25.1 µg/L — ARIZONA WATER CO - LAKESIDE · 12,191 people · 2025 | 2/10 | UCMR-5 |
| Lead | 7.28 µg/L 49% of the EPA limit 15 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 19.83 µg/L — TIMBERLINE MHP · 350 people · 2018 | 8/10 | SYR4 |
| Combined Uranium | 12 µg/L 40% of the EPA limit 30 µg/L Highest in the city: PINEDALE ESTATES DWID · 208 people · 2019 | 1/10 | SYR4 |
| Arsenic | 10 µg/L 100% of the EPA limit 10 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019 | 8/10 | SYR4 |
| TTHM | 1.74 µg/L 2.2% of the EPA limit 80 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 8.55 µg/L — ARIZONA WATER CO - LAKESIDE · 12,191 people · 2019 | 2/10 | SYR4 |
| Gross Alpha, Excl. Radon And U | 7.1 pCi/L 47% of the EPA limit 15 pCi/L Highest in the city: PINEDALE ESTATES DWID · 208 people · 2019 | 1/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 3.5 µg/L 5.8% of the EPA limit 60 µg/L Highest in the city: ARIZONA WATER CO - LAKESIDE · 12,191 people · 2019 | 1/10 | SYR4 |
| Chromium | 3.2 µg/L 3.2% of the EPA limit 100 µg/L Highest in the city: SHOW LOW CROSSROADS HOA · 38 people · 2016 | 2/10 | SYR4 |
| Cadmium | 0.2000 µg/L 4% of the EPA limit 5 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 3 µg/L — PINEDALE ESTATES DWID · 208 people · 2019 | 2/10 | SYR4 |
| Combined Radium (-226 And -228) | 2.7 pCi/L 54% of the EPA limit 5 pCi/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019
Highest in the city: 2.955 pCi/L — PINEDALE ESTATES DWID · 208 people · 2019 | 6/10 | SYR4 |
| Thallium, Total | 1.465 µg/L 73% of the EPA limit 2 µg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2019 | 1/10 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF SHOW LOW · 17,139 people · 2025
Highest in the city: 0.0130 mg/L — TIMBERLAND ACRES DWID · 922 people · 2025 | 10/10 | LCR |
| Endrin | 0.0100 µg/L 0.5% of the EPA limit 2 µg/L Highest in the city: ARIZONA WATER CO - LAKESIDE · 12,191 people · 2018 | 1/10 | SYR4 |
| PFBS | 0.0034 µg/L No EPA limit set Highest in the city: ARIZONA WATER CO - LAKESIDE · 12,191 people · 2025 | 1/10 | UCMR-5 |
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 Show Low
| Supplier | Population served |
|---|---|
| CITY OF SHOW LOW | 17,139 |
| ARIZONA WATER CO - LAKESIDE | 12,191 |
| TIMBERLAND ACRES DWID | 922 |
| WHITE MOUNTAIN WATER COMPANY | 475 |
| COUNTRY LANE TRAILER PARK | 450 |
| TIMBERLINE MHP | 350 |
| PINEDALE ESTATES DWID | 208 |
| NAVAJO WATER - LAGUNA ESTATES | 89 |
| CANYON VISTA ESTATES | 75 |
| SHOW LOW CROSSROADS HOA | 38 |
Frequently asked questions about Show Low tap water
Is Show Low tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Show Low. 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 Show Low?
10 public water suppliers report drinking-water monitoring for Show Low, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Show Low's water?
The contaminants EPA monitoring detected in Show Low include Selenium, Nitrate, Nitrate-Nitrite, Copper, Fluoride. 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.