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Tap water quality report

Highline Water District

EPA monitoring tested this supplier for 104 contaminants and detected 14. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

104
contaminants tested
14
detected
100,170
people served
9
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
SWP
Ownership
Local government
Counties served
King

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.

9
health-based violations
9
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1992-01-01 → 1992-01-31
MCL Health-based Archived 1992-01-01 → 1992-01-31
MCL Health-based Archived 1992-01-01 → 1992-01-31
MCL Health-based Archived 1991-12-01 → 1991-12-31
MCL Health-based Archived 1991-12-01 → 1991-12-31
MCL Health-based Archived 1991-12-01 → 1991-12-31
MCL Health-based Archived 1991-11-01 → 1991-11-30
MCL Health-based Archived 1991-11-01 → 1991-11-30
MCL Health-based Archived 1991-11-01 → 1991-11-30

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
43.495 µg/L 54%
of the EPA limit 80 µg/L
worst single sample: 63.48 µg/L
240/240 SYR4 2012–2019
Chloroform
39.46 µg/L
No EPA limit set
worst single sample: 60.2 µg/L
235/237 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
39.235 µg/L 65%
of the EPA limit 60 µg/L
worst single sample: 57.9 µg/L
234/234 SYR4 2012–2019
Trichloroacetic Acid
23.43 µg/L
No EPA limit set
worst single sample: 38.1 µg/L
230/230 SYR4 2012–2019
Dichloroacetic Acid
17.93 µg/L
No EPA limit set
worst single sample: 26.7 µg/L
228/228 SYR4 2012–2019
Bromodichloromethane
5.558 µg/L
No EPA limit set
worst single sample: 7.4 µg/L
225/228 SYR4 2012–2019
Dibromochloromethane
2.45 µg/L
No EPA limit set
worst single sample: 3.8 µg/L
151/228 SYR4 2012–2019
Monochloroacetic Acid
3.1485 µg/L
No EPA limit set
worst single sample: 7.3 µg/L
58/236 SYR4 2012–2019
Lead
0.0014 mg/L 9.3%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
Dibromoacetic Acid
1.0585 µg/L
No EPA limit set
worst single sample: 1.13 µg/L
14/236 SYR4 2012–2019
Fluoride
890 µg/L 22%
of the EPA limit 4000 µg/L
worst single sample: 900 µg/L
3/4 SYR4 2012–2015
Barium
10 µg/L 0.5%
of the EPA limit 2000 µg/L
 2/4 SYR4 2012–2015
Bromoform
0.6936 µg/L
No EPA limit set
worst single sample: 0.7000 µg/L
2/244 SYR4 2012–2019
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 1/4 SYR4 2012–2015
90 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Phillip Hite

Frequently asked questions about Highline Water District

Is Highline Water District tap water safe to drink?

EPA monitoring detected 14 contaminants in Highline Water District'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 Highline Water District's water?

EPA monitoring detected TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, Dichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Highline Water District serve?

Highline Water District reports serving 100,170 people in Washington, per its EPA record.

Has Highline Water District had any water quality violations?

The EPA has 9 violations on file for Highline Water District, of which 9 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.