What was found in Collinsville'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 |
|---|---|---|---|
| Copper | 1515.75 µg/L 117% of the EPA limit, at the 95th percentile of samples — 1300 µg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019 | 2/2 | SYR4 |
| Fluoride | 220 µg/L 5.5% of the EPA limit 4000 µg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2013
Highest in the city: 800 µg/L — COLLINSVILLE · 5,400 people · 2013 | 2/2 | SYR4 |
| Nitrate-Nitrite | 358 µg/L 3.6% of the EPA limit 10000 µg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019 | 2/2 | SYR4 |
| TTHM | 90.26999999999998 µg/L 113% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019
Highest in the city: 90.65999999999998 µg/L — COLLINSVILLE · 5,400 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 61.824999999999996 µg/L 103% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019
Highest in the city: 84.41799999999999 µg/L — COLLINSVILLE · 5,400 people · 2019 | 2/2 | SYR4 |
| Chloroform | 49.43499999999992 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019
Highest in the city: 57.0775 µg/L — COLLINSVILLE · 5,400 people · 2019 | 2/2 | SYR4 |
| Barium | 47 µg/L 2.4% of the EPA limit 2000 µg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2013
Highest in the city: 48.4 µg/L — COLLINSVILLE · 5,400 people · 2013 | 2/2 | SYR4 |
| Dichloroacetic Acid | 28.234999999999992 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019
Highest in the city: 44.16799999999999 µg/L — COLLINSVILLE · 5,400 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 26.025 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019
Highest in the city: 30.174 µg/L — COLLINSVILLE · 5,400 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 28.15999999999999 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 21.379999999999995 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019 | 2/2 | SYR4 |
| Lead | 8.2 µg/L 55% of the EPA limit 15 µg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019
Highest in the city: 17.299999999999997 µg/L — COLLINSVILLE · 5,400 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 4.79 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019
Highest in the city: 17.144499999999997 µg/L — COLLINSVILLE · 5,400 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 5.635999999999999 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 5.6 pCi/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2017 | 2/2 | SYR4 |
| Bromoform | 4.139499999999999 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 2.57 µg/L No EPA limit set Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.4690 pCi/L 9.4% of the EPA limit 5 pCi/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2017
Highest in the city: 1.32 pCi/L — COLLINSVILLE · 5,400 people · 2019 | 2/2 | SYR4 |
| Dalapon | 1.2 µg/L 0.6% of the EPA limit 200 µg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.7430 pCi/L 5% of the EPA limit 15 pCi/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2017 | 1/2 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WASHINGTON CO RWD #3 (NEW,#1) · 25,375 people · 2025 | 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 Collinsville
| Supplier | Population served |
|---|---|
| WASHINGTON CO RWD #3 (NEW,#1) | 25,375 |
| COLLINSVILLE | 5,400 |
Frequently asked questions about Collinsville tap water
Is Collinsville tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Collinsville. 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 Collinsville?
2 public water suppliers report drinking-water monitoring for Collinsville, Oklahoma to the EPA. Each is listed above with its population served.
What contaminants are in Collinsville's water?
The contaminants EPA monitoring detected in Collinsville include Copper, Fluoride, Nitrate-Nitrite, TTHM, Total Haloacetic Acids (HAA5). 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.