What was found in ZIP 66618
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 | 2/2 | SYR4 |
| Fluoride | 813 µg/L 20% of the EPA limit 4000 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/2 | 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 | 2/2 | 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: 78.95 µg/L — SHAWNEE CO RWD 4C · 12,000 people · 2017 | 2/2 | SYR4 |
| TTHM | 64.4 µg/L 81% of the EPA limit 80 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/2 | SYR4 |
| Copper | 31 µg/L 2.4% of the EPA limit 1300 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/2 | SYR4 |
| Chloroform | 24.85 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2012 | 2/2 | SYR4 |
| Lithium | 18.2 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2025
Highest in the ZIP: 21 µg/L — SHAWNEE CO RWD 4C · 12,000 people · 2025 | 2/2 | UCMR-5 |
| 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: 18.6 µg/L — SHAWNEE CO RWD 4C · 12,000 people · 2017 | 2/2 | SYR4 |
| Bromodichloromethane | 14.85 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2012 | 2/2 | SYR4 |
| Selenium | 5.975 µg/L 12% of the EPA limit 50 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019
Highest in the ZIP: 12.265 µg/L — SHAWNEE CO RWD 4C · 12,000 people · 2017 | 2/2 | SYR4 |
| Monochloroacetic Acid | 12.03 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 4C · 12,000 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 9.595 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 4C · 12,000 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 8.815 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 4C · 12,000 people · 2019 | 1/2 | 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: 6.735 µg/L — SHAWNEE CO RWD 4C · 12,000 people · 2017 | 2/2 | SYR4 |
| Dibromochloromethane | 5.67 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2012 | 2/2 | SYR4 |
| Dibromoacetic Acid | 2.88 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 4C · 12,000 people · 2019 | 1/2 | SYR4 |
| Bromoform | 2.42 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 4C · 12,000 people · 2019 | 1/2 | SYR4 |
| Arsenic | 1.61 µg/L 16% of the EPA limit 10 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019
Highest in the ZIP: 2.09 µg/L — SHAWNEE CO RWD 4C · 12,000 people · 2017 | 2/2 | SYR4 |
| Atrazine | 1.7 µg/L 57% of the EPA limit 3 µg/L Main supplier: TOPEKA, CITY OF · 125,963 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 1.22 µg/L No EPA limit set Highest in the ZIP: SHAWNEE CO RWD 4C · 12,000 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0051 µg/L No EPA limit set Main supplier: TOPEKA, CITY OF · 125,963 people · 2025
Highest in the ZIP: 0.0058 µg/L — SHAWNEE CO RWD 4C · 12,000 people · 2025 | 2/2 | 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 | 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.
Water suppliers serving ZIP 66618
| Supplier | State | Population served |
|---|---|---|
| TOPEKA, CITY OF | KS | 125,963 |
| SHAWNEE CO RWD 4C | KS | 12,000 |
Frequently asked questions about ZIP 66618 tap water
Is the tap water in ZIP 66618 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 66618. 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 66618?
2 public water suppliers report EPA drinking-water monitoring for ZIP 66618. Each is listed above with its population served.
What contaminants are in ZIP 66618's water?
EPA monitoring detected Nitrate, Fluoride, Total Haloacetic Acids (HAA5), Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.