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Tap water quality report

Auburn City of

EPA monitoring tested this supplier for 87 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

87
contaminants tested
18
detected
107,655
people served
3
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Ground water
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.

3
health-based violations
127
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1996-08-01 → 1996-08-31
MCL Health-based Archived 1995-09-01 → 1995-09-30
MCL Health-based Archived 1993-09-01 → 1993-09-30
MR Monitoring Archived 2025-01-01 → 2025-12-31
MR Monitoring Archived 2025-01-01 → 2025-12-31
MR Monitoring Resolved 2005-01-01 → 2005-03-31
MR Monitoring Resolved 2005-01-01 → 2005-03-31
MR Monitoring Resolved 2005-01-01 → 2005-03-31
MR Monitoring Resolved 2005-01-01 → 2005-03-31
MR Monitoring Resolved 2005-01-01 → 2005-03-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0041 µg/L 2/11 2025

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
18.94 µg/L 24%
of the EPA limit 80 µg/L
worst single sample: 42.7 µg/L
173/173 SYR4 2012–2018
Chloroform
10.425 µg/L
No EPA limit set
worst single sample: 37.3 µg/L
166/182 SYR4 2012–2019
Bromodichloromethane
4.565 µg/L
No EPA limit set
worst single sample: 7.1 µg/L
148/179 SYR4 2012–2019
Dibromochloromethane
5.115 µg/L
No EPA limit set
worst single sample: 6.6 µg/L
138/173 SYR4 2012–2019
Nitrate
3500 µg/L 35%
of the EPA limit 10000 µg/L
worst single sample: 3600 µg/L
90/96 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
18.06 µg/L 30%
of the EPA limit 60 µg/L
worst single sample: 43.5 µg/L
89/174 SYR4 2012–2018
Dichloroacetic Acid
8.025 µg/L
No EPA limit set
worst single sample: 18.3 µg/L
88/176 SYR4 2012–2019
Trichloroacetic Acid
11.54 µg/L
No EPA limit set
worst single sample: 25.2 µg/L
49/178 SYR4 2012–2019
Bromoform
1.6 µg/L
No EPA limit set
worst single sample: 2.1 µg/L
36/182 SYR4 2012–2019
Nitrate-Nitrite
3500 µg/L 35%
of the EPA limit 10000 µg/L
worst single sample: 3600 µg/L
36/43 SYR4 2012–2018
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 14/43 SYR4 2012–2018
Lead
0.0022 mg/L 15%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2024
Copper
318 µg/L 24%
of the EPA limit 1300 µg/L
worst single sample: 340 µg/L
12/43 SYR4 2012–2018
Dibromoacetic Acid
1.8 µg/L
No EPA limit set
 10/180 SYR4 2012–2019
Lead
15.5 µg/L 103%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 18 µg/L
6/43 SYR4 2012–2018
Cadmium
0.2900 µg/L 5.8%
of the EPA limit 5 µg/L
worst single sample: 0.3000 µg/L
2/43 SYR4 2012–2018
Monobromoacetic Acid
1.3 µg/L
No EPA limit set
 1/180 SYR4 2012–2019
69 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, TotalBariumBenzeneBeryllium, TotalChlorobenzeneCyanideCarbon TetrachlorideChromiumDichloromethaneDalaponDinosebEthylene DibromideEthylbenzeneFluorideHfpo-DaMercuryMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Joshua Flanders

Frequently asked questions about Auburn City of

Is Auburn City of tap water safe to drink?

EPA monitoring detected 18 contaminants in Auburn City of'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 Auburn City of's water?

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

How many people does Auburn City of serve?

Auburn City of reports serving 107,655 people in Washington, per its EPA record.

Has Auburn City of had any water quality violations?

The EPA has 127 violations on file for Auburn City of, of which 3 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.