What was found in Haiku'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 | 5200 µg/L 52% of the EPA limit 10000 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 5135 µg/L 51% of the EPA limit 10000 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019 | 3/3 | SYR4 |
| Fluoride | 309.5 µg/L 7.7% of the EPA limit 4000 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019 | 2/3 | SYR4 |
| Nitrite | 160 µg/L 16% of the EPA limit 1000 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019 | 1/3 | SYR4 |
| Copper | 58.7 µg/L 4.5% of the EPA limit 1300 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019
Highest in the city: 104.5 µg/L — HAIKU TOWN WATER ASSOCIATION, INC. · 20 people · 2019 | 2/3 | SYR4 |
| Lead | 18.61 µg/L 124% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019
Highest in the city: 36.95 µg/L — HAIKU TOWN WATER ASSOCIATION, INC. · 20 people · 2019 | 2/3 | SYR4 |
| Barium | 22.49 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019 | 3/3 | SYR4 |
| Selenium | 12 µg/L 24% of the EPA limit 50 µg/L Highest in the city: HAIKU TOWN WATER ASSOCIATION, INC. · 20 people · 2019 | 1/3 | SYR4 |
| TTHM | 1.995 µg/L 2.5% of the EPA limit 80 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019
Highest in the city: 10.66 µg/L — WEST KUIAHA MEADOWS · 60 people · 2019 | 3/3 | SYR4 |
| Gross Beta Particle Activity | 6.69 pCi/L No EPA limit set Highest in the city: HAIKU TOWN WATER ASSOCIATION, INC. · 20 people · 2019 | 1/3 | SYR4 |
| Bromoform | 1.995 µg/L No EPA limit set Main supplier: MAUNAOLU PLANTATION · 100 people · 2019
Highest in the city: 5.88 µg/L — WEST KUIAHA MEADOWS · 60 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 3.865 µg/L No EPA limit set Highest in the city: WEST KUIAHA MEADOWS · 60 people · 2019 | 1/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.1 µg/L 1.8% of the EPA limit 60 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019
Highest in the city: 2.39 µg/L — WEST KUIAHA MEADOWS · 60 people · 2019 | 2/3 | SYR4 |
| Arsenic | 2.1 µg/L 21% of the EPA limit 10 µg/L Highest in the city: HAIKU TOWN WATER ASSOCIATION, INC. · 20 people · 2019 | 1/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.8 pCi/L 12% of the EPA limit 15 pCi/L Highest in the city: HAIKU TOWN WATER ASSOCIATION, INC. · 20 people · 2019 | 1/3 | SYR4 |
| Dibromoacetic Acid | 1.1 µg/L No EPA limit set Main supplier: MAUNAOLU PLANTATION · 100 people · 2019
Highest in the city: 1.38 µg/L — WEST KUIAHA MEADOWS · 60 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 1.3 µg/L No EPA limit set Highest in the city: WEST KUIAHA MEADOWS · 60 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 1.29 µg/L No EPA limit set Highest in the city: WEST KUIAHA MEADOWS · 60 people · 2019 | 1/3 | SYR4 |
| Ethylene Dibromide | 0.1600 µg/L 320% of the EPA limit, at the 95th percentile of samples — 0.0500 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019 | 1/3 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0219 µg/L 11% of the EPA limit 0.2000 µg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2019 | 2/3 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MAUNAOLU PLANTATION · 100 people · 2022 | 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.
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 Haiku
| Supplier | Population served |
|---|---|
| MAUNAOLU PLANTATION | 100 |
| WEST KUIAHA MEADOWS | 60 |
| HAIKU TOWN WATER ASSOCIATION, INC. | 20 |
Frequently asked questions about Haiku tap water
Is Haiku tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Haiku. 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 Haiku?
3 public water suppliers report drinking-water monitoring for Haiku, Hawaii to the EPA. Each is listed above with its population served.
What contaminants are in Haiku's water?
The contaminants EPA monitoring detected in Haiku include Nitrate, Nitrate-Nitrite, Fluoride, Nitrite, Copper. 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.