What was found in Winchester'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 | 4775 µg/L 48% of the EPA limit 10000 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019
Highest in the city: 7270 µg/L — WINCHESTER, CITY OF · 450 people · 2019 | 2/2 | SYR4 |
| Copper | 1194.35 µg/L 92% of the EPA limit 1300 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2017 | 2/2 | SYR4 |
| Barium | 302.5 µg/L 15% of the EPA limit 2000 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2017
Highest in the city: 319 µg/L — WINCHESTER, CITY OF · 450 people · 2017 | 2/2 | SYR4 |
| Fluoride | 288.5 µg/L 7.2% of the EPA limit 4000 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2017 | 2/2 | SYR4 |
| TTHM | 70.5 µg/L 88% of the EPA limit 80 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 2/2 | SYR4 |
| Lithium | 58 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2024 | 1/2 | UCMR-5 |
| Chloroform | 51 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 40.5 µg/L 68% of the EPA limit 60 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 29.5 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 17 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 2/2 | SYR4 |
| Selenium | 13.85 µg/L 28% of the EPA limit 50 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2017 | 2/2 | SYR4 |
| Lead | 2.925 µg/L 19% of the EPA limit 15 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2017
Highest in the city: 9.47 µg/L — WINCHESTER, CITY OF · 450 people · 2017 | 2/2 | SYR4 |
| Trichloroacetic Acid | 8.1 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 7.85 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 5.83 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 1/2 | SYR4 |
| Chromium | 1.1 µg/L 1.1% of the EPA limit 100 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2017
Highest in the city: 3.6 µg/L — WINCHESTER, CITY OF · 450 people · 2017 | 2/2 | SYR4 |
| Bromoform | 1.33 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019
Highest in the city: 3.275 µg/L — WINCHESTER, CITY OF · 450 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 3 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 2/2 | SYR4 |
| Arsenic | 1.29 µg/L 13% of the EPA limit 10 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2017 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.25 µg/L No EPA limit set Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.6950 pCi/L 14% of the EPA limit 5 pCi/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2016
Highest in the city: 0.7000 pCi/L — WINCHESTER, CITY OF · 450 people · 2016 | 2/2 | SYR4 |
| Atrazine | 0.1400 µg/L 4.7% of the EPA limit 3 µg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2018 | 1/2 | SYR4 |
| Lead | 0.0034 mg/L 23% of the EPA limit 0.0150 mg/L Main supplier: JEFFERSON CO RWD 12 · 3,635 people · 2023 | 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 Winchester
| Supplier | Population served |
|---|---|
| JEFFERSON CO RWD 12 | 3,635 |
| WINCHESTER, CITY OF | 450 |
Frequently asked questions about Winchester tap water
Is Winchester tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Winchester. 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 Winchester?
2 public water suppliers report drinking-water monitoring for Winchester, Kansas to the EPA. Each is listed above with its population served.
What contaminants are in Winchester's water?
The contaminants EPA monitoring detected in Winchester include Nitrate, Copper, Barium, Fluoride, 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.