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Tap water quality report

Kwonesum

EPA monitoring tested this supplier for 82 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

82
contaminants tested
16
detected
42
people served
0
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Ground water
Ownership
Native American

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

0
health-based violations
1
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2014-04-03

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
411 µg/L 32%
of the EPA limit 1300 µg/L
 24/26 SYR4 2013–2018
Lead
7 µg/L 47%
of the EPA limit 15 µg/L
 13/27 SYR4 2013–2018
Bromodichloromethane
14.1 µg/L
No EPA limit set
 9/9 SYR4 2013–2019
Chloroform
28.7 µg/L
No EPA limit set
 9/9 SYR4 2013–2019
Dibromochloromethane
5.7 µg/L
No EPA limit set
 9/9 SYR4 2013–2019
Lead
0.0013 mg/L 8.7%
of the EPA limit 0.0150 mg/L
 7/7 LCR 2024
Dichloroacetic Acid
11.6 µg/L
No EPA limit set
 4/4 SYR4 2013–2019
Trichloroacetic Acid
11.3 µg/L
No EPA limit set
 4/4 SYR4 2013–2019
Combined Radium (-226 And -228)
1.5 pCi/L 30%
of the EPA limit 5 pCi/L
 3/5 SYR4 2013–2014
Dibromoacetic Acid
1.5 µg/L
No EPA limit set
 3/4 SYR4 2013–2019
TTHM
35 µg/L 44%
of the EPA limit 80 µg/L
 3/3 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
24.4 µg/L 41%
of the EPA limit 60 µg/L
 3/3 SYR4 2013–2019
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 2/2 SYR4 2014
Barium
2 µg/L 0.1%
of the EPA limit 2000 µg/L
 1/2 SYR4 2014
Bromoform
0.5000 µg/L
No EPA limit set
 1/9 SYR4 2013–2019
Gross Beta Particle Activity
4.1 pCi/L
No EPA limit set
 1/6 SYR4 2013–2014
66 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitrateNitrate-NitriteNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
POPPE, MIKE
Phone
360-466-7223
Email
MPOPPE@SWINOMISH.NSN.US

Frequently asked questions about Kwonesum

Is Kwonesum tap water safe to drink?

EPA monitoring detected 16 contaminants in Kwonesum's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Kwonesum's water?

EPA monitoring detected Copper, Lead, Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Kwonesum serve?

Kwonesum reports serving 42 people in Washington, per its EPA record.

Has Kwonesum had any water quality violations?

The EPA has 1 violation on file for Kwonesum, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.