What was found in Wailuku'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 | 2990 µg/L 30% of the EPA limit 10000 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 2980 µg/L 30% of the EPA limit 10000 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Fluoride | 335 µg/L 8.4% of the EPA limit 4000 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Copper | 46.2 µg/L 3.6% of the EPA limit 1300 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| TTHM | 26.9 µg/L 34% of the EPA limit 80 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Bromoform | 18 µg/L No EPA limit set Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Selenium | 11.51 µg/L 23% of the EPA limit 50 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Barium | 11.425 µg/L 0.6% of the EPA limit 2000 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 7 µg/L No EPA limit set Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 5.88 µg/L No EPA limit set Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.5 µg/L 9.2% of the EPA limit 60 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Lead | 4.5 µg/L 30% of the EPA limit 15 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Chromium | 4.4 µg/L 4.4% of the EPA limit 100 µg/L Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 3.56 µg/L No EPA limit set Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 3.46 µg/L No EPA limit set Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 3.4 pCi/L No EPA limit set Main supplier: WAILUKU · 74,511 people · 2018 | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.9 pCi/L 19% of the EPA limit 15 pCi/L Main supplier: WAILUKU · 74,511 people · 2018 | 1/1 | SYR4 |
| Bromodichloromethane | 2.8 µg/L No EPA limit set Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Chloroform | 2.775 µg/L No EPA limit set Main supplier: WAILUKU · 74,511 people · 2019 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.5 µg/L 25% of the EPA limit 6 µg/L Main supplier: WAILUKU · 74,511 people · 2018 | 1/1 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WAILUKU · 74,511 people · 2018 | 1/1 | LCR |
Water suppliers serving Wailuku
| Supplier | Population served |
|---|---|
| WAILUKU | 74,511 |
Frequently asked questions about Wailuku tap water
Is Wailuku tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Wailuku. 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 Wailuku?
1 public water supplier report drinking-water monitoring for Wailuku, Hawaii to the EPA. Each is listed above with its population served.
What contaminants are in Wailuku's water?
The contaminants EPA monitoring detected in Wailuku include Nitrate, Nitrate-Nitrite, Fluoride, Copper, 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.