Sammamish Plateau Water & Sewer (WA) Water Quality

Sammamish Plateau Water & Sewer is a large public water system in EPA region 10 that provides tap water for the 98029, 98074, 98075 zip codes. It has 10 facilities where the water supply was tested for 85 chemical contaminants that impact tap water quality and human health.

The maximum reported level of HAA5 (five regulated haloacetic acids) was 43 µg/L. The maximum reported level of Manganese was 110 µg/L. There were 2 contamintants found in the Sammamish Plateau Water & Sewer water supply at levels that were above the minimum reporting level.

Contaminants

1,1-dichloroethane (14)

1,2,3-trichloropropane (14)

1,3-butadiene (14)

1,4-dioxane (14)

1-butanol (16)

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

17-alpha-ethynylestradiol (13)

17-beta-estradiol (13)

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 (9)

2,6-dinitrotoluene (9)

2-methoxyethanol (16)

2-propen-1-ol (Allyl Alcohol) (16)

4,4'-dichloro dichlorophenyl ethylene (DDE) (9)

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

4-androstene-3,17-dione (13)

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

alpha-hexachlorocyclohexane (16)

anatoxin-a (8)

bromochloromethane (Halon 1011) (14)

bromomethane (14)

Butylated Hydroxyanisole (16)

chlorate (28)

chlorodifluoromethane (HCFC-22) (14)

chloromethane (14)

chlorpyrifos (16)

chromium (28)

chromium-6 (28)

cobalt (28)

cylindrospermopsin (8)

dimethipin (16)

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

equilin (13)

estriol (13)

estrone (13)

ethoprop (16)

Germanium (16)

HAA5 (five regulated haloacetic acids) (32)

HAA6Br (six brominated haloacetic acids) (32)

HAA9 (nine haloacetic acids) (32)

hexafluoropropylene oxide dimer acid (GenX) (16)

lithium (16)

Manganese (16)

methyl-tertiary-butyl-ether (MTBE) (9)

molinate (9)

molybdenum (28)

N-ethyl perfluorooctanesulfonamidoacetic acid (16)

N-methyl perfluorooctanesulfonamidoacetic acid (16)

nitrobenzene (9)

nonafluoro-3,6-dioxaheptanoic acid (16)

o-toluidine (16)

oxyfluorfen (16)

perchlorate (7)

perfluoro(2-ethoxyethane)sulfonic acid (16)

perfluoro-3-methoxypropanoic acid (16)

perfluoro-4-methoxybutanoic acid (16)

perfluorobutanesulfonic acid (30)

perfluorobutanoic acid (16)

perfluorodecanoic acid (16)

perfluorododecanoic acid (16)

perfluoroheptanesulfonic acid (16)

perfluoroheptanoic acid (30)

perfluorohexanesulfonic acid (30)

perfluorohexanoic acid (16)

perfluorononanoic acid (30)

perfluorooctanesulfonic acid (30)

perfluorooctanoic acid (30)

perfluoropentanesulfonic acid (16)

perfluoropentanoic acid (16)

perfluorotetradecanoic acid (16)

perfluorotridecanoic acid (16)

perfluoroundecanoic acid (16)

profenofos (16)

quinoline (16)

s-ethyl-dipropylthiocarbamate (EPTC) (9)

strontium (28)

tebuconazole (16)

terbacil (9)

testosterone (13)

total microcystins (8)

Total Permethrin (16)

tribufos (16)

vanadium (28)

Sampling Facilities

Well # 1
Ground Water (GW)

Well # 1 Finished Water Analyzer LineEntry Point to the Distribution System (EP)

Well #9 Corrosion Control Facility
Multiple Sources (MX)

Well #9 Corr. Control Facility Finished Water LineEntry Point to the Distribution System (EP)

Well # 12
Ground Water (GW)

Well # 12 Finished Water Ananlyzer LineEntry Point to the Distribution System (EP)

Well # 13
Ground Water (GW)

Well # 13 Finished Water Analyzer LineEntry Point to the Distribution System (EP)

Well # 10
Ground Water (GW)

Well # 10 Finished Water Analyzer lineEntry Point to the Distribution System (EP)

Well #4 Treatment Facility
Ground Water (GW)

Well #4 WTP Finished Water LineEntry Point to the Distribution System (EP)

Wells # 2.1 and 2.2
Ground Water (GW)

Well # 2 Finished Water AnalyzerEntry Point to the Distribution System (EP)

Distribution System
Multiple Sources (MX)

3725 PROVIDENCE POINT DR SEDistribution System (DS)
5524 264th Ave NEDistribution System (DS)
25920 NE 29TH PLDistribution System (DS)
21984 SE 43RD WAYDistribution System (DS)
1627 EAST LAKE SAMMAMISH PKWY NEDistribution System (DS)
24398 NE 80TH STDistribution System (DS)
940 1st Ave NEDistribution System (DS)
8513 255TH AVE NEDistribution System (DS)

Distribution System
Ground Water (GW)

DSMRT for Well #1Maximum Residence Time (MR)
DSMRT for Corrosion Control FacilityMaximum Residence Time (MR)
DSMRT for Well #12Maximum Residence Time (MR)
DSMRT for Well #13Maximum Residence Time (MR)
DSMRT for Well #10Maximum Residence Time (MR)
DSMR for Main Street Treatment FacilityMaximum Residence Time (MR)
DSMRT for Wells #2.1 & #2.2Maximum Residence Time (MR)

WELL #13
Ground Water (GW)

WELL #13SR (SR)

FAQ

Is Sammamish Plateau Water & Sewer tap water safe to drink?

When was Sammamish Plateau Water & Sewer last tested for water contamination?

The latest water samples were taken on February 12th, 2024.