What was found in Ferndale's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 11100 µg/L 111% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Highest in the city: RATHBONE PARK WATER ASSOC · 240 people · 2019 | 16/20 | SYR4 |
| Nitrate-Nitrite | 9870 µg/L 99% of the EPA limit 10000 µg/L Highest in the city: RATHBONE PARK WATER ASSOC · 240 people · 2018 | 12/20 | SYR4 |
| Fluoride | 250 µg/L 6.3% of the EPA limit 4000 µg/L Main supplier: FERNDALE · 19,305 people · 2016
Highest in the city: 1483 µg/L — LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2019 | 9/20 | SYR4 |
| Copper | 31.4 µg/L 2.4% of the EPA limit 1300 µg/L Main supplier: FERNDALE · 19,305 people · 2016
Highest in the city: 295.3 µg/L — LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2019 | 2/20 | SYR4 |
| TTHM | 70.94 µg/L 89% of the EPA limit 80 µg/L Main supplier: FERNDALE · 19,305 people · 2019
Highest in the city: 75.66 µg/L — FERNDALE ESTATES LLC · 85 people · 2019 | 15/20 | SYR4 |
| Barium | 70 µg/L 3.5% of the EPA limit 2000 µg/L Main supplier: FERNDALE · 19,305 people · 2016 | 9/20 | SYR4 |
| Bromoform | 58.42 µg/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2019
Highest in the city: 59.36 µg/L — FERNDALE ESTATES LLC · 85 people · 2019 | 10/20 | SYR4 |
| Chloroform | 1.765 µg/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2019
Highest in the city: 54.02 µg/L — LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2019 | 12/20 | SYR4 |
| Dibromochloromethane | 11.9 µg/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2019
Highest in the city: 27.8 µg/L — FERNDALE ESTATES LLC · 85 people · 2019 | 14/20 | SYR4 |
| Total Haloacetic Acids (HAA5) | 12.1 µg/L 20% of the EPA limit 60 µg/L Main supplier: FERNDALE · 19,305 people · 2019
Highest in the city: 15.96 µg/L — LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2019 | 16/20 | SYR4 |
| Arsenic | 5 µg/L 50% of the EPA limit 10 µg/L Main supplier: FERNDALE · 19,305 people · 2016
Highest in the city: 14.2 µg/L — LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2019 | 10/20 | SYR4 |
| Trichloroacetic Acid | 13.17 µg/L No EPA limit set Highest in the city: LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2019 | 9/20 | SYR4 |
| Dibromoacetic Acid | 10.025 µg/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2019 | 13/20 | SYR4 |
| Bromodichloromethane | 4.095 µg/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2019
Highest in the city: 9.935 µg/L — FERNDALE ESTATES LLC · 85 people · 2019 | 14/20 | SYR4 |
| Gross Beta Particle Activity | 7.132 pCi/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2015
Highest in the city: 9.276 pCi/L — LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2015 | 4/20 | SYR4 |
| Chromium | 7 µg/L 7% of the EPA limit 100 µg/L Main supplier: FERNDALE · 19,305 people · 2016 | 5/20 | SYR4 |
| Dichloroacetic Acid | 2.95 µg/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2019
Highest in the city: 6.6 µg/L — RATHBONE PARK WATER ASSOC · 240 people · 2017 | 12/20 | SYR4 |
| Selenium | 5 µg/L 10% of the EPA limit 50 µg/L Main supplier: FERNDALE · 19,305 people · 2016 | 2/20 | SYR4 |
| Lead | 4 µg/L 27% of the EPA limit 15 µg/L Highest in the city: LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2019 | 1/20 | SYR4 |
| Monochloroacetic Acid | 2.39 µg/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2019 | 1/20 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Highest in the city: LUMMI TRIBAL WATER DISTRICT · 3,699 people · 2015 | 1/20 | SYR4 |
| Monobromoacetic Acid | 1.46 µg/L No EPA limit set Main supplier: FERNDALE · 19,305 people · 2019 | 2/20 | SYR4 |
| Lead | 0.0056 mg/L 37% of the EPA limit 0.0150 mg/L Main supplier: FERNDALE · 19,305 people · 2024
Highest in the city: 0.0095 mg/L — DOUBLE L MOBILE HOME PARK · 58 people · 2024 | 20/20 | LCR |
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 the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Ferndale
Frequently asked questions about Ferndale tap water
Is Ferndale tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Ferndale. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Ferndale?
20 public water suppliers report drinking-water monitoring for Ferndale, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Ferndale's water?
The contaminants EPA monitoring detected in Ferndale include Nitrate, Nitrate-Nitrite, Fluoride, Copper, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.
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.