Kalaheo-Koloa (HI) Water Quality

Kalaheo-Koloa is a large public water system in EPA region 9 that provides tap water for the 96741, 96765 zip codes. It has 23 facilities where the water supply was tested for 65 chemical contaminants that impact tap water quality and human health.

The maximum reported level of HAA5 (five regulated haloacetic acids) was 0.83 µg/L. There were 1 contamintants found in the Kalaheo-Koloa water supply at levels that were above the minimum reporting level.

Contaminants

1,1-dichloroethane (20)

1,2,3-trichloropropane (20)

1,3-butadiene (20)

1,4-dioxane (20)

1-butanol (20)

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (18)

1H,1H,2H,2H-perfluorodecane sulfonic acid (18)

1H,1H,2H,2H-perfluorohexane sulfonic acid (18)

1H,1H,2H,2H-perfluorooctane sulfonic acid (18)

2-methoxyethanol (20)

2-propen-1-ol (Allyl Alcohol) (20)

4,8-dioxa-3H-perfluorononanoic acid (18)

9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (18)

alpha-hexachlorocyclohexane (20)

bromochloromethane (Halon 1011) (20)

bromomethane (20)

Butylated Hydroxyanisole (20)

chlorate (32)

chlorodifluoromethane (HCFC-22) (20)

chloromethane (20)

chlorpyrifos (20)

chromium (32)

chromium-6 (32)

cobalt (32)

dimethipin (20)

ethoprop (20)

Germanium (20)

HAA5 (five regulated haloacetic acids) (6)

HAA6Br (six brominated haloacetic acids) (6)

HAA9 (nine haloacetic acids) (6)

hexafluoropropylene oxide dimer acid (GenX) (18)

lithium (18)

Manganese (20)

molybdenum (32)

N-ethyl perfluorooctanesulfonamidoacetic acid (18)

N-methyl perfluorooctanesulfonamidoacetic acid (18)

nonafluoro-3,6-dioxaheptanoic acid (18)

o-toluidine (20)

oxyfluorfen (20)

perfluoro(2-ethoxyethane)sulfonic acid (18)

perfluoro-3-methoxypropanoic acid (18)

perfluoro-4-methoxybutanoic acid (18)

perfluorobutanesulfonic acid (38)

perfluorobutanoic acid (18)

perfluorodecanoic acid (18)

perfluorododecanoic acid (18)

perfluoroheptanesulfonic acid (18)

perfluoroheptanoic acid (38)

perfluorohexanesulfonic acid (38)

perfluorohexanoic acid (18)

perfluorononanoic acid (38)

perfluorooctanesulfonic acid (38)

perfluorooctanoic acid (38)

perfluoropentanesulfonic acid (18)

perfluoropentanoic acid (18)

perfluorotetradecanoic acid (18)

perfluorotridecanoic acid (18)

perfluoroundecanoic acid (18)

profenofos (20)

quinoline (20)

strontium (32)

tebuconazole (20)

Total Permethrin (20)

tribufos (20)

vanadium (32)

Sampling Facilities

TP003 - KOLOA WELL A CHLORINATOR
Ground Water (GW)

006 - HOSE BIBB AT GATEEntry Point to the Distribution System (EP)

TP005 - KOLOA WELL E CHLORINATOR
Ground Water (GW)

005 - HOSE BIBB AT GATEEntry Point to the Distribution System (EP)

TP006 - KOLOA WELL C CHLORINATOR
Ground Water (GW)

004 - HOSE BIBB AT CONTROL BUILDINGEntry Point to the Distribution System (EP)

TP007 - KOLOA WELL D CHLORINATOR
Ground Water (GW)

003 - NEXT TO CNTROL BLDGEntry Point to the Distribution System (EP)

TP008 - LAWAI WELL 2 CHLORINATOR
Ground Water (GW)

011 - HOSEBIB OUTSIDE CTRL BLDGEntry Point to the Distribution System (EP)

TP009 - LAWAI WELL 1 CHLORINATOR
Ground Water (GW)

012 - TAP AT DUMP SUMPEntry Point to the Distribution System (EP)

TP010 - KOLOA WELL F CHLOR
Ground Water (GW)

008 - HOSEBIB ON CONTROL BLDG SE CORNEREntry Point to the Distribution System (EP)

TP011 - KOLOA WELL B CHLORINATOR
Ground Water (GW)

025 - HOSEBIB AT WELL A,B,E GATEEntry Point to the Distribution System (EP)

TP100 - KALHEO DEEP WELL 1 & 2 CHLORINATOR
Ground Water (GW)

014 - KALAHEO 908 TANKEntry Point to the Distribution System (EP)

3910 Ulu Alii
Ground Water (GW)

3910 Ulu Alii HAADistribution System (DS)

Spouting Horn Park
Ground Water (GW)

Spouting Horn Park HAADistribution System (DS)

Koloa Well C Chlorinator
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Koloa Well D Chlorinator
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Koloa Well A Chlorinator
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Lawai Well 2
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Lawai Well 1
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Kalaheo-Koloa
Ground Water (GW)

3910 Ulu Alii St.Distribution System (DS)

Koloa Well E
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Koloa Well F Chlorinator
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Kalaheo Deep Wells 1 & 2
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Piwai Well #2
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Piwai Well #3
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Distribution System
Ground Water (GW)

DSMRT for Koloa Wells C, D & FMaximum Residence Time (MR)
DSMRT for Koloa Well AMaximum Residence Time (MR)
DSMRT for Lawai WellsMaximum Residence Time (MR)
DSMRT for Koloa Well EMaximum Residence Time (MR)
DSMRT for Kalaheo Deep Wells 1 & 2Maximum Residence Time (MR)
DSMRT for Piwai WellsMaximum Residence Time (MR)

FAQ

Is Kalaheo-Koloa tap water safe to drink?

When was Kalaheo-Koloa last tested for water contamination?

The latest water samples were taken on May 12th, 2025.