Mililani (HI) Water Quality

Mililani is a large public water system in EPA region 9 that provides tap water for the 96789 zip codes. It has 11 facilities where the water supply was tested for 75 chemical contaminants that impact tap water quality and human health.

The maximum reported level of HAA5 (five regulated haloacetic acids) was 0.21 µg/L. The maximum reported level of Manganese was 2.4 µg/L. There were 2 contamintants found in the Mililani water supply at levels that were above the minimum reporting level.

Contaminants

1,1-dichloroethane (6)

1,2,3-trichloropropane (6)

1,3-butadiene (6)

1,4-dioxane (6)

1-butanol (6)

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (6)

1H,1H,2H,2H-perfluorodecane sulfonic acid (6)

1H,1H,2H,2H-perfluorohexane sulfonic acid (6)

1H,1H,2H,2H-perfluorooctane sulfonic acid (6)

2,4-dinitrotoluene (11)

2,6-dinitrotoluene (11)

2-methoxyethanol (6)

2-propen-1-ol (Allyl Alcohol) (6)

4,4'-dichloro dichlorophenyl ethylene (DDE) (11)

4,8-dioxa-3H-perfluorononanoic acid (6)

9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (6)

alpha-hexachlorocyclohexane (6)

bromochloromethane (Halon 1011) (6)

bromomethane (6)

Butylated Hydroxyanisole (6)

chlorate (8)

chlorodifluoromethane (HCFC-22) (6)

chloromethane (6)

chlorpyrifos (6)

chromium (8)

chromium-6 (8)

cobalt (8)

dimethipin (6)

dimethyl tetrachloroterephthalate (DCPA) mono/di-acid degradate (11)

ethoprop (6)

Germanium (6)

HAA5 (five regulated haloacetic acids) (4)

HAA6Br (six brominated haloacetic acids) (4)

HAA9 (nine haloacetic acids) (4)

hexafluoropropylene oxide dimer acid (GenX) (6)

lithium (6)

Manganese (6)

methyl-tertiary-butyl-ether (MTBE) (11)

molinate (11)

molybdenum (8)

N-ethyl perfluorooctanesulfonamidoacetic acid (6)

N-methyl perfluorooctanesulfonamidoacetic acid (6)

nitrobenzene (11)

nonafluoro-3,6-dioxaheptanoic acid (6)

o-toluidine (6)

oxyfluorfen (6)

perchlorate (11)

perfluoro(2-ethoxyethane)sulfonic acid (6)

perfluoro-3-methoxypropanoic acid (6)

perfluoro-4-methoxybutanoic acid (6)

perfluorobutanesulfonic acid (12)

perfluorobutanoic acid (6)

perfluorodecanoic acid (6)

perfluorododecanoic acid (6)

perfluoroheptanesulfonic acid (6)

perfluoroheptanoic acid (12)

perfluorohexanesulfonic acid (12)

perfluorohexanoic acid (6)

perfluorononanoic acid (12)

perfluorooctanesulfonic acid (12)

perfluorooctanoic acid (12)

perfluoropentanesulfonic acid (6)

perfluoropentanoic acid (6)

perfluorotetradecanoic acid (6)

perfluorotridecanoic acid (6)

perfluoroundecanoic acid (6)

profenofos (6)

quinoline (6)

s-ethyl-dipropylthiocarbamate (EPTC) (11)

strontium (8)

tebuconazole (6)

terbacil (11)

Total Permethrin (6)

tribufos (6)

vanadium (8)

Sampling Facilities

Mililani Wells 1 & 2
Ground Water (GW)

Mililani Wells 1 & 2 post Cl2Entry Point to the Distribution System (EP)

Mililani Well 3
Ground Water (GW)

Mililani Well 3 post Cl2Entry Point to the Distribution System (EP)

Mililani Well 4
Ground Water (GW)

Mililani Well 4 post Cl2Entry Point to the Distribution System (EP)

94-389 Makapipipi St
Ground Water (GW)

94-389 Makapipipi StDistribution System (DS)

Mililani Golf Course - restroom
Ground Water (GW)

Mililani Golf Course - restroomDistribution System (DS)

MILILANI I PUMP 1 2800-01
Ground Water (GW)

MILILANI I PUMP 1 2800-01UK (UK)

MILILANI I PUMP2 2800-02
Ground Water (GW)

MILILANI I PUMP2 2800-02UK (UK)

MILILANI I PUMP3 2800-03
Ground Water (GW)

MILILANI I PUMP3 2800-03UK (UK)

MILILANI II P5 2859-01
Ground Water (GW)

MILILANI II P5 2859-01UK (UK)

MILILANI II P6 2859-02
Ground Water (GW)

MILILANI II P6 2859-02UK (UK)

MILILANI MAUKA WELL #10
Ground Water (GW)

MILILANI MAUKA WELL #10UK (UK)

FAQ

Is Mililani tap water safe to drink?

When was Mililani last tested for water contamination?

The latest water samples were taken on September 21st, 2023.