What was found in ZIP 66409
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 1750 µg/L 18% of the EPA limit 10000 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/3 | SYR4 |
| Copper | 31 µg/L 2.4% of the EPA limit 1300 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019
Highest in the ZIP: 1000 µg/L — DOUGLAS CO RWD 3 · 4,663 people · 2019 | 3/3 | SYR4 |
| Fluoride | 813 µg/L 20% of the EPA limit 4000 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/3 | SYR4 |
| Barium | 50.9 µg/L 2.5% of the EPA limit 2000 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019
Highest in the ZIP: 142.4 µg/L — DOUGLAS CO RWD 3 · 4,663 people · 2019 | 2/3 | SYR4 |
| TTHM | 64.4 µg/L 81% of the EPA limit 80 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019
Highest in the ZIP: 88.55 µg/L — SHAWNEE CO RWD 8 · 6,073 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 80.045 µg/L 133% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 3/3 | SYR4 |
| Chloroform | 24.85 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2012
Highest in the ZIP: 64 µg/L — SHAWNEE CO RWD 8 · 6,073 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 47.75 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 8 · 6,073 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 14.85 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2012
Highest in the ZIP: 20.55 µg/L — SHAWNEE CO RWD 8 · 6,073 people · 2019 | 3/3 | SYR4 |
| Lithium | 18.2 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2025
Highest in the ZIP: 18.8 µg/L — SHAWNEE CO RWD 8 · 6,073 people · 2025 | 2/3 | UCMR-5 |
| Trichloroacetic Acid | 17 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 8 · 6,073 people · 2019 | 2/3 | SYR4 |
| Lead | 7.695 µg/L 51% of the EPA limit 15 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019
Highest in the ZIP: 8.76 µg/L — DOUGLAS CO RWD 3 · 4,663 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 5.67 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2012
Highest in the ZIP: 7.15 µg/L — SHAWNEE CO RWD 8 · 6,073 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 6.25 µg/L No EPA limit set Highest in the ZIP: DOUGLAS CO RWD 3 · 4,663 people · 2019 | 2/3 | SYR4 |
| Selenium | 5.975 µg/L 12% of the EPA limit 50 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/3 | SYR4 |
| Chromium | 1.19 µg/L 1.2% of the EPA limit 100 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019
Highest in the ZIP: 5.7 µg/L — DOUGLAS CO RWD 3 · 4,663 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 3.22 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 8 · 6,073 people · 2019 | 2/3 | SYR4 |
| Atrazine | 1.7 µg/L 57% of the EPA limit 3 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/3 | SYR4 |
| Arsenic | 1.61 µg/L 16% of the EPA limit 10 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/3 | SYR4 |
| Monobromoacetic Acid | 1.55 µg/L No EPA limit set Highest in the ZIP: DOUGLAS CO RWD 3 · 4,663 people · 2019 | 2/3 | SYR4 |
| Bromoform | 0.7660 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 8 · 6,073 people · 2019 | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 0.4850 pCi/L 9.7% of the EPA limit 5 pCi/L Highest in the ZIP: DOUGLAS CO RWD 3 · 4,663 people · 2015 | 1/3 | SYR4 |
| Pfba | 0.0051 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2025 | 1/3 | UCMR-5 |
| PFHXS | 0.0033 µg/L No EPA limit set Highest in the ZIP: DOUGLAS CO RWD 3 · 4,663 people · 2024 | 2/3 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set Highest in the ZIP: DOUGLAS CO RWD 3 · 4,663 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0024 mg/L 16% of the EPA limit 0.0150 mg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2023 | 3/3 | 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.
Water suppliers serving ZIP 66409
| Supplier | State | Population served |
|---|---|---|
| TOPEKA, CITY OF | KS | 125,963 |
| SHAWNEE CO RWD 8 | KS | 6,073 |
| DOUGLAS CO RWD 3 | KS | 4,663 |
Frequently asked questions about ZIP 66409 tap water
Is the tap water in ZIP 66409 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 66409. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 66409?
3 public water suppliers report EPA drinking-water monitoring for ZIP 66409. Each is listed above with its population served.
What contaminants are in ZIP 66409's water?
EPA monitoring detected Nitrate, Copper, Fluoride, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.