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Tap water quality report

Lahaina, HI

EPA monitoring detected 21 contaminants across the 2 water suppliers serving Lahaina. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
20,107
people served
21
contaminants found
Hawaii rankings Lead in Hawaii PFAS in Hawaii

What was found in Lahaina's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
430 µg/L 4.3%
of the EPA limit 10000 µg/L
 1/2 SYR4
Nitrate-Nitrite
430 µg/L 4.3%
of the EPA limit 10000 µg/L
 1/2 SYR4
Fluoride
80 µg/L 2%
of the EPA limit 4000 µg/L
 1/2 SYR4
TTHM
61 µg/L 76%
of the EPA limit 80 µg/L
 2/2 SYR4
Total Haloacetic Acids (HAA5)
59 µg/L 98%
of the EPA limit 60 µg/L
 2/2 SYR4
Chloroform
42 µg/L
No EPA limit set
 2/2 SYR4
Trichloroacetic Acid
31 µg/L
No EPA limit set
 1/2 SYR4
Copper
26 µg/L 2%
of the EPA limit 1300 µg/L
 1/2 SYR4
Dichloroacetic Acid
24 µg/L
No EPA limit set
 2/2 SYR4
Bromoform
15 µg/L
No EPA limit set
 2/2 SYR4
Bromodichloromethane
12 µg/L
No EPA limit set
 2/2 SYR4
Dibromochloromethane
8.2 µg/L
No EPA limit set
 2/2 SYR4
Barium
6 µg/L 0.3%
of the EPA limit 2000 µg/L
 1/2 SYR4
Monochloroacetic Acid
5 µg/L
No EPA limit set
 1/2 SYR4
Dibromoacetic Acid
3 µg/L
No EPA limit set
 2/2 SYR4
Chromium
2.8 µg/L 2.8%
of the EPA limit 100 µg/L
 1/2 SYR4
Monobromoacetic Acid
1.9 µg/L
No EPA limit set
 1/2 SYR4
Lead
1.6 µg/L 11%
of the EPA limit 15 µg/L
 1/2 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.2600 µg/L 130%
of the EPA limit, in the worst sample — 0.2000 µg/L
 1/2 SYR4
Ethylene Dibromide
0.0120 µg/L 24%
of the EPA limit 0.0500 µg/L
 1/2 SYR4
Lead
0.00078 mg/L 5.2%
of the EPA limit 0.0150 mg/L
 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 single worst sample on record — 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 Lahaina

SupplierPopulation served
LAHAINA 20,065
HONOKOHAU 42

Frequently asked questions about Lahaina tap water

Is Lahaina tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Lahaina. 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 Lahaina?

2 public water suppliers report drinking-water monitoring for Lahaina, Hawaii to the EPA. Each is listed above with its population served.

What contaminants are in Lahaina's water?

The contaminants EPA monitoring detected in Lahaina include Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Total Haloacetic Acids (HAA5). The full list, with the highest level found 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.