Tap WaterIndex

← Washington

Tap water quality report

Olympia City of

EPA monitoring tested this supplier for 110 contaminants and detected 23. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

110
contaminants tested
23
detected
126,966
people served
3
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Ground water
Ownership
Local government
Counties served
Thurston

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
36
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2014-10-01
TT Health-based Resolved 2014-10-01
TT Health-based Archived 2004-08-01 → 2004-08-31
Other Monitoring Resolved 2025-07-01
MR Monitoring Archived 2007-01-01 → 2007-12-31
MR Monitoring Archived 2007-01-01 → 2007-12-31
MR Monitoring Archived 2007-01-01 → 2007-12-31
MR Monitoring Archived 2007-01-01 → 2007-12-31
MR Monitoring Archived 2007-01-01 → 2007-12-31
MR Monitoring Archived 2007-01-01 → 2007-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0048 µg/L 2/12 2024
Pfhxa 0.0040 µg/L 1/12 2024
PFOA 0.0043 µg/L 1/12 2024
PFOS 0.0058 µg/L 1/12 2024
Pfpea 0.0033 µg/L 1/12 2024

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
9.225 µg/L 12%
of the EPA limit 80 µg/L
worst single sample: 31.1 µg/L
88/88 SYR4 2012–2019
Bromodichloromethane
3.267 µg/L
No EPA limit set
worst single sample: 6.4 µg/L
79/99 SYR4 2012–2019
Dibromochloromethane
2.204 µg/L
No EPA limit set
worst single sample: 3 µg/L
79/97 SYR4 2012–2019
Chloroform
4.3 µg/L
No EPA limit set
worst single sample: 21.2 µg/L
76/101 SYR4 2012–2019
Nitrate
2512.5 µg/L 25%
of the EPA limit 10000 µg/L
worst single sample: 2630 µg/L
76/96 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
5.41 µg/L 9%
of the EPA limit 60 µg/L
worst single sample: 5.9 µg/L
40/91 SYR4 2012–2019
Dichloroacetic Acid
2.68 µg/L
No EPA limit set
worst single sample: 3.9 µg/L
37/91 SYR4 2012–2019
Trichloroacetic Acid
1.8 µg/L
No EPA limit set
worst single sample: 2.2 µg/L
21/96 SYR4 2012–2019
Lead
0.0034 mg/L 23%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2025
Barium
8.6 µg/L 0.4%
of the EPA limit 2000 µg/L
worst single sample: 13 µg/L
12/12 SYR4 2012–2019
Nitrate-Nitrite
2415 µg/L 24%
of the EPA limit 10000 µg/L
worst single sample: 2460 µg/L
11/12 SYR4 2012–2019
Arsenic
2 µg/L 20%
of the EPA limit 10 µg/L
 6/12 SYR4 2012–2019
Dibromoacetic Acid
1.65 µg/L
No EPA limit set
worst single sample: 1.7 µg/L
6/96 SYR4 2012–2019
Bromoform
0.5850 µg/L
No EPA limit set
worst single sample: 0.6000 µg/L
4/105 SYR4 2012–2019
Gross Beta Particle Activity
1.791 pCi/L
No EPA limit set
worst single sample: 1.82 pCi/L
3/13 SYR4 2012–2019
Copper
7 µg/L 0.5%
of the EPA limit 1300 µg/L
 2/12 SYR4 2012–2019
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
 1/12 SYR4 2012–2019
Xylenes, Total
0.4000 µg/L 0%
of the EPA limit 10000 µg/L
 1/12 SYR4 2012–2016
87 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, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Cheri Reimers

Frequently asked questions about Olympia City of

Is Olympia City of tap water safe to drink?

EPA monitoring detected 23 contaminants in Olympia 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 Olympia City of's water?

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

How many people does Olympia City of serve?

Olympia City of reports serving 126,966 people in Washington, per its EPA record.

Has Olympia City of had any water quality violations?

The EPA has 36 violations on file for Olympia 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.