What was found in ZIP 42431
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 |
|---|---|---|---|
| Fluoride | 925 µg/L 23% of the EPA limit 4000 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019 | 2/5 | SYR4 |
| Chlorite | 640 µg/L 64% of the EPA limit 1000 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019
Highest in the ZIP: 642.5 µg/L — DAWSON SPRINGS WATER & SEWER · 2,631 people · 2019 | 2/5 | SYR4 |
| Nitrate | 400 µg/L 4% of the EPA limit 10000 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019 | 2/5 | SYR4 |
| Copper | 108 µg/L 8.3% of the EPA limit 1300 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019
Highest in the ZIP: 181.4 µg/L — SOUTH HOPKINS WATER DISTRICT · 8,440 people · 2017 | 5/5 | SYR4 |
| TTHM | 116 µg/L 145% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019
Highest in the ZIP: 149.6 µg/L — NORTH HOPKINS WATER DISTRICT · 3,725 people · 2019 | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 63.74999999999997 µg/L 106% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019
Highest in the ZIP: 72 µg/L — DAWSON SPRINGS WATER & SEWER · 2,631 people · 2019 | 5/5 | SYR4 |
| Cyanide | 20 µg/L 10% of the EPA limit 200 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019
Highest in the ZIP: 40 µg/L — DAWSON SPRINGS WATER & SEWER · 2,631 people · 2019 | 2/5 | SYR4 |
| Barium | 36.65 µg/L 1.8% of the EPA limit 2000 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019 | 2/5 | SYR4 |
| Lead | 2.94 µg/L 20% of the EPA limit 15 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2018
Highest in the ZIP: 7 µg/L — SOUTH HOPKINS WATER DISTRICT · 8,440 people · 2017 | 5/5 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2014
Highest in the ZIP: 4.255000000000001 pCi/L — DAWSON SPRINGS WATER & SEWER · 2,631 people · 2017 | 2/5 | SYR4 |
| Arsenic | 1.04 µg/L 10% of the EPA limit 10 µg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2019 | 2/5 | SYR4 |
| Di(2-ethylhexyl) Adipate | 0.3000 µg/L 0.1% of the EPA limit 400 µg/L Highest in the ZIP: DAWSON SPRINGS WATER & SEWER · 2,631 people · 2018 | 1/5 | SYR4 |
| Mercury | 0.2000 µg/L 10% of the EPA limit 2 µg/L Highest in the ZIP: DAWSON SPRINGS WATER & SEWER · 2,631 people · 2019 | 1/5 | SYR4 |
| Pfba | 0.0068 µg/L No EPA limit set Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2025
Highest in the ZIP: 0.0079 µg/L — NEBO WATER DISTRICT · 4,702 people · 2024 | 4/5 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MADISONVILLE LIGHT & WATER · 28,102 people · 2024
Highest in the ZIP: 0.0020 mg/L — SOUTH HOPKINS WATER DISTRICT · 8,440 people · 2023 | 5/5 | 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 42431
| Supplier | State | Population served |
|---|---|---|
| MADISONVILLE LIGHT & WATER | KY | 28,102 |
| SOUTH HOPKINS WATER DISTRICT | KY | 8,440 |
| NEBO WATER DISTRICT | KY | 4,702 |
| NORTH HOPKINS WATER DISTRICT | KY | 3,725 |
| DAWSON SPRINGS WATER & SEWER | KY | 2,631 |
Frequently asked questions about ZIP 42431 tap water
Is the tap water in ZIP 42431 safe to drink?
EPA testing detected 15 contaminants across the water suppliers serving ZIP 42431. 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 42431?
5 public water suppliers report EPA drinking-water monitoring for ZIP 42431. Each is listed above with its population served.
What contaminants are in ZIP 42431's water?
EPA monitoring detected Fluoride, Chlorite, Nitrate, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.