Is Thunderbird Terrace Water Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Private
Counties served: Snohomish

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2020-04-01 → 2020-06-30
MCL	Health-based	Resolved	2020-04-01 → 2020-06-30
MR	Monitoring	Resolved	2025-11-01 → 2025-11-30
MR	Monitoring	Resolved	2025-11-01 → 2025-11-30
MR	Monitoring	Resolved	2025-01-01 → 2025-12-31
MR	Monitoring	Resolved	2024-06-01 → 2024-06-30
MR	Monitoring	Resolved	2024-06-01 → 2024-06-30
MON	Monitoring	Resolved	2022-12-01 → 2022-12-31
MR	Monitoring	Resolved	2021-08-01 → 2021-08-31
MR	Monitoring	Resolved	2021-08-01 → 2021-08-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	1100 µg/L 11% of the EPA limit 10000 µg/L	14/16	SYR4	2012–2019
Bromodichloromethane	4.086 µg/L No EPA limit set worst single sample: 4.47 µg/L	13/13	SYR4	2012–2019
Chloroform	42.7 µg/L No EPA limit set worst single sample: 43.6 µg/L	13/14	SYR4	2012–2019
Dichloroacetic Acid	31.4 µg/L No EPA limit set worst single sample: 33.8 µg/L	13/13	SYR4	2012–2019
TTHM	46.43 µg/L 58% of the EPA limit 80 µg/L worst single sample: 47.18 µg/L	13/13	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	90.414 µg/L 151% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 95.4 µg/L	13/13	SYR4	2012–2019
Trichloroacetic Acid	61.84 µg/L No EPA limit set worst single sample: 62.2 µg/L	13/13	SYR4	2012–2019
Lead	0.00060 mg/L 4% of the EPA limit 0.0150 mg/L	10/10	LCR	2025
Nitrate-Nitrite	1034 µg/L 10% of the EPA limit 10000 µg/L worst single sample: 1100 µg/L	7/8	SYR4	2012–2019
Dibromoacetic Acid	2.272 µg/L No EPA limit set worst single sample: 2.36 µg/L	2/13	SYR4	2012–2019
Dibromochloromethane	0.4120 µg/L No EPA limit set worst single sample: 0.4200 µg/L	2/13	SYR4	2012–2019
Monobromoacetic Acid	2.8875 µg/L No EPA limit set worst single sample: 2.89 µg/L	2/13	SYR4	2012–2019
Bromoform	0.4000 µg/L No EPA limit set	1/13	SYR4	2012–2019
Monochloroacetic Acid	7.2 µg/L No EPA limit set	1/13	SYR4	2012–2019

29 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAsbestosBenzeneChlorobenzeneCarbon TetrachlorideDichloromethaneDalaponDinosebEthylbenzeneNitritePentachlorophenolPicloramStyreneTetrachloroethyleneTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: Donovan Sheppard

Frequently asked questions about Thunderbird Terrace Water

Is Thunderbird Terrace Water tap water safe to drink?

EPA monitoring detected 14 contaminants in Thunderbird Terrace Water'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 Thunderbird Terrace Water's water?

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

How many people does Thunderbird Terrace Water serve?

Thunderbird Terrace Water reports serving 75 people in Washington, per its EPA record.

Has Thunderbird Terrace Water had any water quality violations?

The EPA has 26 violations on file for Thunderbird Terrace Water, of which 2 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.