What was found in Ada'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-Nitrite | 1340 µg/L 13% of the EPA limit 10000 µg/L Main supplier: ADA · 22,600 people · 2019
Highest in the city: 5368.5 µg/L — PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 2/4 | SYR4 |
| Fluoride | 840 µg/L 21% of the EPA limit 4000 µg/L Main supplier: ADA · 22,600 people · 2015 | 1/4 | SYR4 |
| Copper | 299.6 µg/L 23% of the EPA limit 1300 µg/L Main supplier: ADA · 22,600 people · 2019
Highest in the city: 364.019 µg/L — PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 4/4 | SYR4 |
| Barium | 49 µg/L 2.5% of the EPA limit 2000 µg/L Main supplier: ADA · 22,600 people · 2015
Highest in the city: 75.89 µg/L — PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 2/4 | SYR4 |
| TTHM | 9.76 µg/L 12% of the EPA limit 80 µg/L Main supplier: ADA · 22,600 people · 2019
Highest in the city: 56.858 µg/L — PONTOTOC CO RWD # 1 (HOMER) · 441 people · 2017 | 4/4 | SYR4 |
| Lead | 9.6325 µg/L 64% of the EPA limit 15 µg/L Main supplier: ADA · 22,600 people · 2019
Highest in the city: 10.385 µg/L — PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 4/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.483 pCi/L 30% of the EPA limit 15 pCi/L Main supplier: ADA · 22,600 people · 2017
Highest in the city: 5.686 pCi/L — PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 2/4 | SYR4 |
| Chloroform | 3.759 µg/L No EPA limit set Main supplier: ADA · 22,600 people · 2019
Highest in the city: 5.4855 µg/L — PONTOTOC CO RWD # 1 (HOMER) · 441 people · 2017 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.11 µg/L 1.9% of the EPA limit 60 µg/L Main supplier: ADA · 22,600 people · 2019
Highest in the city: 4.92 µg/L — PONTOTOC CO RWD # 7 · 4,863 people · 2019 | 3/4 | SYR4 |
| Gross Beta Particle Activity | 3.89 pCi/L No EPA limit set Main supplier: ADA · 22,600 people · 2017 | 2/4 | SYR4 |
| Bromodichloromethane | 3.754 µg/L No EPA limit set Main supplier: ADA · 22,600 people · 2019 | 3/4 | SYR4 |
| Bromoform | 0.9460 µg/L No EPA limit set Main supplier: ADA · 22,600 people · 2019
Highest in the city: 3.542 µg/L — PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 3/4 | SYR4 |
| Dibromochloromethane | 2.825 µg/L No EPA limit set Main supplier: ADA · 22,600 people · 2019 | 4/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.6 µg/L 43% of the EPA limit 6 µg/L Main supplier: ADA · 22,600 people · 2019 | 1/4 | SYR4 |
| Monobromoacetic Acid | 1.67 µg/L No EPA limit set Highest in the city: PONTOTOC CO RWD # 7 · 4,863 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.45825 pCi/L 29% of the EPA limit 5 pCi/L Main supplier: ADA · 22,600 people · 2017 | 2/4 | SYR4 |
| Antimony, Total | 1.26 µg/L 21% of the EPA limit 6 µg/L Main supplier: ADA · 22,600 people · 2015 | 1/4 | SYR4 |
| Dibromoacetic Acid | 1.25 µg/L No EPA limit set Highest in the city: PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 1/4 | SYR4 |
| Dichloroacetic Acid | 1.14 µg/L No EPA limit set Highest in the city: PONTOTOC CO RWD # 7 · 4,863 people · 2019 | 1/4 | SYR4 |
| Trichloroacetic Acid | 1.11 µg/L No EPA limit set Main supplier: ADA · 22,600 people · 2019 | 2/4 | SYR4 |
| Selenium | 1.1 µg/L 2.2% of the EPA limit 50 µg/L Highest in the city: PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 1/4 | SYR4 |
| Monochloroacetic Acid | 1.09 µg/L No EPA limit set Highest in the city: PONTOTOC CO RWD # 7 · 4,863 people · 2019 | 1/4 | SYR4 |
| Arsenic | 0.6884 µg/L 6.9% of the EPA limit 10 µg/L Main supplier: ADA · 22,600 people · 2017 | 1/4 | SYR4 |
| Chromium | 0.5600 µg/L 0.6% of the EPA limit 100 µg/L Highest in the city: PONTOTOC CO RWD # 8 · 4,250 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0017 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: ADA · 22,600 people · 2025
Highest in the city: 0.0023 mg/L — PONTOTOC CO RWD # 1 (HOMER) · 441 people · 2025 | 4/4 | 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 Ada
| Supplier | Population served |
|---|---|
| ADA | 22,600 |
| PONTOTOC CO RWD # 7 | 4,863 |
| PONTOTOC CO RWD # 8 | 4,250 |
| PONTOTOC CO RWD # 1 (HOMER) | 441 |
Frequently asked questions about Ada tap water
Is Ada tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Ada. 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 Ada?
4 public water suppliers report drinking-water monitoring for Ada, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Ada's water?
The contaminants EPA monitoring detected in Ada include Nitrate-Nitrite, Fluoride, Copper, Barium, 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.