What was found in Hays'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 | 5955 µg/L 60% of the EPA limit 10000 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2019
Highest in the city: 10000 µg/L — HAYS SUBURBAN ESTATES · 38 people · 2019 | 7/9 | SYR4 |
| Fluoride | 587 µg/L 15% of the EPA limit 4000 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2018 | 7/9 | SYR4 |
| Copper | 96.25 µg/L 7.4% of the EPA limit 1300 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2018
Highest in the city: 402 µg/L — MEADOW ACRES MHP HAYS KS, LLC · 134 people · 2018 | 9/9 | SYR4 |
| Barium | 8.73 µg/L 0.4% of the EPA limit 2000 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2018
Highest in the city: 308.5 µg/L — ELLIS CO RWD 6 · 383 people · 2018 | 7/9 | SYR4 |
| Lithium | 105 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2023 | 1/9 | UCMR-5 |
| TTHM | 72.9 µg/L 91% of the EPA limit 80 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 7/9 | SYR4 |
| Dibromochloromethane | 27.9 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 9/9 | SYR4 |
| Total Haloacetic Acids (HAA5) | 25 µg/L 42% of the EPA limit 60 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 8/9 | SYR4 |
| Lead | 6.925 µg/L 46% of the EPA limit 15 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2018
Highest in the city: 22.55 µg/L — COUNTRY VIEW MOBILE HOME PARK · 125 people · 2019 | 9/9 | SYR4 |
| Bromoform | 20.9 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 9/9 | SYR4 |
| Chromium | 2.615 µg/L 2.6% of the EPA limit 100 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2018
Highest in the city: 18.6 µg/L — SUNSET VALLEY MHP HAYS KS, LLC · 60 people · 2018 | 7/9 | SYR4 |
| Bromodichloromethane | 17 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 7/9 | SYR4 |
| Dibromoacetic Acid | 13 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 9/9 | SYR4 |
| Selenium | 6.66 µg/L 13% of the EPA limit 50 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2018
Highest in the city: 12.6 µg/L — SUNSET VALLEY MHP HAYS KS, LLC · 60 people · 2018 | 7/9 | SYR4 |
| Chloroform | 11 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 6/9 | SYR4 |
| Dichloroacetic Acid | 8.4 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 8/9 | SYR4 |
| Monochloroacetic Acid | 8.06 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 4/9 | SYR4 |
| Arsenic | 1.39 µg/L 14% of the EPA limit 10 µg/L Main supplier: HAYS, CITY OF · 21,040 people · 2018
Highest in the city: 6.4 µg/L — ELLIS CO RWD 6 · 383 people · 2018 | 7/9 | SYR4 |
| Monobromoacetic Acid | 3.05 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019
Highest in the city: 3.2685 µg/L — MEADOW ACRES MHP HAYS KS, LLC · 134 people · 2017 | 6/9 | SYR4 |
| Combined Radium (-226 And -228) | 0.6000 pCi/L 12% of the EPA limit 5 pCi/L Main supplier: HAYS, CITY OF · 21,040 people · 2015
Highest in the city: 1.565 pCi/L — MEADOW ACRES MHP HAYS KS, LLC · 134 people · 2018 | 6/9 | SYR4 |
| Trichloroacetic Acid | 1.5 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2019 | 5/9 | SYR4 |
| Atrazine | 0.9180 µg/L 31% of the EPA limit 3 µg/L Highest in the city: HAYS SUBURBAN ESTATES · 38 people · 2019 | 5/9 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: HAYS, CITY OF · 21,040 people · 2024
Highest in the city: 0.0111 mg/L — COUNTRYSIDE ESTATES MHP HAYS KS, LLC · 300 people · 2025 | 9/9 | LCR |
| Pfpea | 0.0107 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2023 | 1/9 | UCMR-5 |
| 6:2 Fts | 0.0070 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2023 | 1/9 | UCMR-5 |
| Pfhxa | 0.0061 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2023 | 1/9 | UCMR-5 |
| PFBS | 0.0038 µg/L No EPA limit set Main supplier: HAYS, CITY OF · 21,040 people · 2023 | 1/9 | 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 Hays
| Supplier | Population served |
|---|---|
| HAYS, CITY OF | 21,040 |
| ELLIS CO RWD 6 | 383 |
| ELLIS CO RWD 1C | 340 |
| COUNTRYSIDE ESTATES MHP HAYS KS, LLC | 300 |
| BUFFALO HILLS PARK | 135 |
| MEADOW ACRES MHP HAYS KS, LLC | 134 |
| COUNTRY VIEW MOBILE HOME PARK | 125 |
| SUNSET VALLEY MHP HAYS KS, LLC | 60 |
| HAYS SUBURBAN ESTATES | 38 |
Frequently asked questions about Hays tap water
Is Hays tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Hays. 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 Hays?
9 public water suppliers report drinking-water monitoring for Hays, Kansas to the EPA. Each is listed above with its population served.
What contaminants are in Hays's water?
The contaminants EPA monitoring detected in Hays include Nitrate, Fluoride, Copper, Barium, Lithium. 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.