City of Los Banos (CA) Water Quality

City of Los Banos is a large public water system in EPA region 9 that provides tap water for the 93635 zip codes. It has 30 facilities where the water supply was tested for 75 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 20.47 µg/L. The maximum reported level of Manganese was 12 µg/L. There were 3 contamintants found in the City of Los Banos water supply at levels that were above the minimum reporting level.

Contaminants

1,1-dichloroethane (26)

1,2,3-trichloropropane (26)

1,3-butadiene (26)

1,4-dioxane (26)

1-butanol (26)

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (26)

1H,1H,2H,2H-perfluorodecane sulfonic acid (26)

1H,1H,2H,2H-perfluorohexane sulfonic acid (26)

1H,1H,2H,2H-perfluorooctane sulfonic acid (26)

2,4-dinitrotoluene (25)

2,6-dinitrotoluene (25)

2-methoxyethanol (26)

2-propen-1-ol (Allyl Alcohol) (26)

4,4'-dichloro dichlorophenyl ethylene (DDE) (25)

4,8-dioxa-3H-perfluorononanoic acid (26)

9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (26)

alpha-hexachlorocyclohexane (26)

bromochloromethane (Halon 1011) (26)

bromomethane (26)

Butylated Hydroxyanisole (26)

chlorate (34)

chlorodifluoromethane (HCFC-22) (26)

chloromethane (26)

chlorpyrifos (26)

chromium (34)

chromium-6 (34)

cobalt (34)

dimethipin (26)

dimethyl tetrachloroterephthalate (DCPA) mono/di-acid degradate (24)

ethoprop (26)

Germanium (26)

HAA5 (five regulated haloacetic acids) (8)

HAA6Br (six brominated haloacetic acids) (8)

HAA9 (nine haloacetic acids) (8)

hexafluoropropylene oxide dimer acid (GenX) (26)

lithium (26)

Manganese (26)

methyl-tertiary-butyl-ether (MTBE) (25)

molinate (25)

molybdenum (34)

N-ethyl perfluorooctanesulfonamidoacetic acid (26)

N-methyl perfluorooctanesulfonamidoacetic acid (26)

nitrobenzene (25)

nonafluoro-3,6-dioxaheptanoic acid (26)

o-toluidine (26)

oxyfluorfen (26)

perchlorate (25)

perfluoro(2-ethoxyethane)sulfonic acid (26)

perfluoro-3-methoxypropanoic acid (26)

perfluoro-4-methoxybutanoic acid (26)

perfluorobutanesulfonic acid (52)

perfluorobutanoic acid (26)

perfluorodecanoic acid (26)

perfluorododecanoic acid (26)

perfluoroheptanesulfonic acid (26)

perfluoroheptanoic acid (52)

perfluorohexanesulfonic acid (52)

perfluorohexanoic acid (26)

perfluorononanoic acid (52)

perfluorooctanesulfonic acid (52)

perfluorooctanoic acid (52)

perfluoropentanesulfonic acid (26)

perfluoropentanoic acid (26)

perfluorotetradecanoic acid (26)

perfluorotridecanoic acid (26)

perfluoroundecanoic acid (26)

profenofos (26)

quinoline (26)

s-ethyl-dipropylthiocarbamate (EPTC) (25)

strontium (34)

tebuconazole (26)

terbacil (25)

Total Permethrin (26)

tribufos (26)

vanadium (34)

Sampling Facilities

Well 12
Ground Water (GW)

EP #29 - Well 12 TreatedEntry Point to the Distribution System (EP)
add ucmr sp nameEntry Point to the Distribution System (EP)

Well 15
Ground Water (GW)

EP #28 - Well 15 TreatedEntry Point to the Distribution System (EP)

Well 14
Ground Water (GW)

EP #25 - Well 14 TreatedEntry Point to the Distribution System (EP)

Well 13
Ground Water (GW)

EP #24 - Well 13 TreatedEntry Point to the Distribution System (EP)

Well 11
Ground Water (GW)

EP #23 - Well 11 TreatedEntry Point to the Distribution System (EP)

Well 10
Ground Water (GW)

EP #22 - Well 10 TreatedEntry Point to the Distribution System (EP)

Well 9
Ground Water (GW)

EP #21 - Well 9 TreatedEntry Point to the Distribution System (EP)

Well 7
Ground Water (GW)

EP #20 - Well 7 TreatedEntry Point to the Distribution System (EP)

Well 6
Ground Water (GW)

EP #19 - Well 6 TreatedEntry Point to the Distribution System (EP)

Well 5
Ground Water (GW)

EP #18 - Well 5 TreatedEntry Point to the Distribution System (EP)

Well 3
Ground Water (GW)

EP #17 - Well 3 TreatedEntry Point to the Distribution System (EP)

Well 2
Ground Water (GW)

EP #16 - Well 2 TreatedEntry Point to the Distribution System (EP)

Well 1
Ground Water (GW)

EP #15 - Well 1 TreatedEntry Point to the Distribution System (EP)

Sample Station 1
Ground Water (GW)

DS #1 - Sample Station 1Distribution System (DS)

Sample Station 5
Ground Water (GW)

DS #5 - Sample Station 5Distribution System (DS)

Sample Station 6
Ground Water (GW)

DS #6 - Sample Station 6Distribution System (DS)

Sample Station 8
Ground Water (GW)

DS #8 - Sample Station 8Distribution System (DS)

Distribution System
Ground Water (GW)

DSMRT for 5, 7, 10 & 13Maximum Residence Time (MR)
DSMRT for 1, 2 & 3Maximum Residence Time (MR)
DSMRT for 6, 9 & 14Maximum Residence Time (MR)
DSMRT for 11, 12 & 15Maximum Residence Time (MR)

WELL 01
Ground Water (GW)

WELL 01 10S/10E-23E02SR (SR)

WELL 02
Ground Water (GW)

WELL 02 10S/10E-23E01SR (SR)

WELL 03
Ground Water (GW)

WELL 03 10S/10E-22H01SR (SR)

WELL 05
Ground Water (GW)

WELL 05 10S/10E-13E01SR (SR)

WELL 06
Ground Water (GW)

WELL 06 10S/10E-15L01SR (SR)

WELL 07
Ground Water (GW)

WELL 07 10S/10E-13L02SR (SR)

WELL 09
Ground Water (GW)

WELL 09 10S/10E-14B01SR (SR)

WELL 10
Ground Water (GW)

WELL 10 10S/10E-24B01SR (SR)

WELL 11
Ground Water (GW)

WELL 11 10S/10E-21C02SR (SR)

WELL 12
Ground Water (GW)

WELL 12 10S/10E-22D01SR (SR)

WELL 13 - TREATED
Ground Water (GW)

WELL 13 - TREATED 10S/10E-14J01SR (SR)

WELL 14 - TREATED
Ground Water (GW)

WELL 14 - TREATED 10S/10E-11E01SR (SR)

FAQ

Is City of Los Banos tap water safe to drink?

When was City of Los Banos last tested for water contamination?

The latest water samples were taken on March 20th, 2025.