City of Ukiah (CA) Water Quality

City of Ukiah is a large public water system in EPA region 9 that provides tap water for the 95482 zip codes. It has 17 facilities where the water supply was tested for 78 chemical contaminants that impact tap water quality and human health.

The maximum reported level of 1-butanol was 3.2 µg/L. The maximum reported level of HAA5 (five regulated haloacetic acids) was 18.31 µg/L. The maximum reported level of Manganese was 2.6 µg/L. There were 3 contamintants found in the City of Ukiah water supply at levels that were above the minimum reporting level.

Contaminants

1,1-dichloroethane (10)

1,2,3-trichloropropane (10)

1,3-butadiene (10)

1,4-dioxane (10)

1-butanol (12)

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (16)

1H,1H,2H,2H-perfluorodecane sulfonic acid (16)

1H,1H,2H,2H-perfluorohexane sulfonic acid (16)

1H,1H,2H,2H-perfluorooctane sulfonic acid (16)

2,4-dinitrotoluene (13)

2,6-dinitrotoluene (13)

2-methoxyethanol (12)

2-propen-1-ol (Allyl Alcohol) (12)

4,4'-dichloro dichlorophenyl ethylene (DDE) (13)

4,8-dioxa-3H-perfluorononanoic acid (16)

9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (16)

alpha-hexachlorocyclohexane (11)

anatoxin-a (16)

bromochloromethane (Halon 1011) (10)

bromomethane (10)

Butylated Hydroxyanisole (11)

chlorate (20)

chlorodifluoromethane (HCFC-22) (10)

chloromethane (10)

chlorpyrifos (11)

chromium (20)

chromium-6 (20)

cobalt (20)

cylindrospermopsin (16)

dimethipin (11)

dimethyl tetrachloroterephthalate (DCPA) mono/di-acid degradate (12)

ethoprop (11)

Germanium (12)

HAA5 (five regulated haloacetic acids) (16)

HAA6Br (six brominated haloacetic acids) (16)

HAA9 (nine haloacetic acids) (16)

hexafluoropropylene oxide dimer acid (GenX) (16)

lithium (16)

Manganese (12)

methyl-tertiary-butyl-ether (MTBE) (12)

molinate (13)

molybdenum (20)

N-ethyl perfluorooctanesulfonamidoacetic acid (16)

N-methyl perfluorooctanesulfonamidoacetic acid (16)

nitrobenzene (11)

nonafluoro-3,6-dioxaheptanoic acid (16)

o-toluidine (11)

oxyfluorfen (11)

perchlorate (10)

perfluoro(2-ethoxyethane)sulfonic acid (16)

perfluoro-3-methoxypropanoic acid (16)

perfluoro-4-methoxybutanoic acid (16)

perfluorobutanesulfonic acid (26)

perfluorobutanoic acid (16)

perfluorodecanoic acid (16)

perfluorododecanoic acid (16)

perfluoroheptanesulfonic acid (16)

perfluoroheptanoic acid (26)

perfluorohexanesulfonic acid (26)

perfluorohexanoic acid (16)

perfluorononanoic acid (26)

perfluorooctanesulfonic acid (26)

perfluorooctanoic acid (26)

perfluoropentanesulfonic acid (16)

perfluoropentanoic acid (16)

perfluorotetradecanoic acid (16)

perfluorotridecanoic acid (16)

perfluoroundecanoic acid (16)

profenofos (11)

quinoline (11)

s-ethyl-dipropylthiocarbamate (EPTC) (13)

strontium (20)

tebuconazole (11)

terbacil (13)

total microcystins (14)

Total Permethrin (11)

tribufos (11)

vanadium (20)

Sampling Facilities

Well 3 TP
Ground Water (Under Direct Influence of Surface Water) (GU)

EP #24 - Well 3 TreatedEntry Point to the Distribution System (EP)

Ranney Collector TP
Surface Water (SW)

HSPS DSEPEntry Point to the Distribution System (EP)

Well 7 TP
Ground Water (GW)

EP #27 -Well 7 TreatedEntry Point to the Distribution System (EP)

Well 8 TP
Ground Water (GW)

EP #28 - Well 8 TreatedEntry Point to the Distribution System (EP)

Well 4 TP
Ground Water (GW)

EP #29 - Well 4 TreatedEntry Point to the Distribution System (EP)

Well 9 TP
Ground Water (GW)

EP #30 - Well 9 TreatedEntry Point to the Distribution System (EP)

Distribution System-SW
Multiple Sources (MX)

DSMRT for Ranney CollectorDistribution System (DS)
DSMRT for Ranney CollectorMaximum Residence Time (MR)

Distribution System-GW
Multiple Sources (MX)

DSMRT-Well 3Distribution System (DS)

Distribution System-Well 7
Multiple Sources (MX)

DSMRT for Well 7Distribution System (DS)
DSMRT for Well 7Maximum Residence Time (MR)

Distribution System-GW
Multiple Sources (MX)

DSMRT for Well 8Distribution System (DS)

EP- #026 TREATMENT PLANT - WELL 05
Ground Water (GW)

Well #5Entry Point to the Distribution System (EP)

EP- #025 TREATMENT PLANT - WELL 04
Ground Water (GW)

Well #4Entry Point to the Distribution System (EP)

RANNEY COLLECTOR
Surface Water (SW)

RANNEY COLLECTOR C23/003-RANNESR (SR)

WELL 02
Ground Water (GW)

WELL 02 15N/12W-16E02SR (SR)

WELL 03
Ground Water (GW)

WELL 03 15N/12W-16Q01SR (SR)

WELL 04
Ground Water (GW)

WELL 04 15N/12W-20R02SR (SR)

WELL 05
Ground Water (GW)

WELL 05 15N/12W-16M01SR (SR)

FAQ

Is City of Ukiah tap water safe to drink?

When was City of Ukiah last tested for water contamination?

The latest water samples were taken on August 1st, 2024.