What was found in Westminster'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 | 6170 µg/L 62% of the EPA limit 10000 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 11710 µg/L — PLEASANT VALLEY · 150 people · 2019 | 5/5 | SYR4 |
| Nitrate-Nitrite | 6877.5 µg/L 69% of the EPA limit 10000 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 4/5 | SYR4 |
| Fluoride | 724 µg/L 18% of the EPA limit 4000 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 784 µg/L — FREEDOM DISTRICT · 24,867 people · 2019 | 3/5 | SYR4 |
| TTHM | 95.595 µg/L 119% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 106.8 µg/L — FREEDOM DISTRICT · 24,867 people · 2019 | 5/5 | SYR4 |
| Barium | 85.8 µg/L 4.3% of the EPA limit 2000 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 4/5 | SYR4 |
| Chloroform | 77.89 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 63.9 µg/L 107% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 64.67 µg/L — FREEDOM DISTRICT · 24,867 people · 2019 | 5/5 | SYR4 |
| Dichloroacetic Acid | 37.24 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2015 | 5/5 | SYR4 |
| Trichloroacetic Acid | 26.135 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2015 | 3/5 | SYR4 |
| Selenium | 20 µg/L 40% of the EPA limit 50 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 1/5 | SYR4 |
| Bromodichloromethane | 15.33 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 5/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.895 pCi/L 19% of the EPA limit 15 pCi/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 12.875 pCi/L — FREEDOM DISTRICT · 24,867 people · 2018 | 2/5 | SYR4 |
| Gross Beta Particle Activity | 5.76 pCi/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 10.49 pCi/L — FREEDOM DISTRICT · 24,867 people · 2018 | 3/5 | SYR4 |
| Chromium | 10.4 µg/L 10% of the EPA limit 100 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 2/5 | SYR4 |
| Monochloroacetic Acid | 6.92 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2015
Highest in the city: 8.14 µg/L — FREEDOM DISTRICT · 24,867 people · 2015 | 2/5 | SYR4 |
| Dibromoacetic Acid | 2.27 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2015
Highest in the city: 6.95 µg/L — FREEDOM DISTRICT · 24,867 people · 2015 | 4/5 | SYR4 |
| Dibromochloromethane | 3.4 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 5.57 µg/L — BARK HILL BIBLE CHURCH · 163 people · 2017 | 5/5 | SYR4 |
| Arsenic | 5.455 µg/L 55% of the EPA limit 10 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 2/5 | SYR4 |
| Bromoform | 1.49 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2018
Highest in the city: 4.632 µg/L — BARK HILL BIBLE CHURCH · 163 people · 2017 | 4/5 | SYR4 |
| Combined Uranium | 4 µg/L 13% of the EPA limit 30 µg/L Highest in the city: FREEDOM DISTRICT · 24,867 people · 2015 | 1/5 | SYR4 |
| Monobromoacetic Acid | 3.885 µg/L No EPA limit set Highest in the city: FREEDOM DISTRICT · 24,867 people · 2015 | 1/5 | SYR4 |
| Cadmium | 3.75 µg/L 75% of the EPA limit 5 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 1/5 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 2.602 µg/L 43% of the EPA limit 6 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019 | 2/5 | SYR4 |
| Combined Radium (-226 And -228) | 1.68 pCi/L 34% of the EPA limit 5 pCi/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 1.895 pCi/L — FREEDOM DISTRICT · 24,867 people · 2018 | 2/5 | SYR4 |
| Atrazine | 0.4620 µg/L 15% of the EPA limit 3 µg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2019
Highest in the city: 0.5800 µg/L — FREEDOM DISTRICT · 24,867 people · 2019 | 3/5 | SYR4 |
| Pfpea | 0.0667 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2025 | 2/5 | UCMR-5 |
| Pfhxa | 0.0246 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2025 | 2/5 | UCMR-5 |
| Pfba | 0.0201 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2025 | 1/5 | UCMR-5 |
| PFOA | 0.0124 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2025 | 1/5 | UCMR-5 |
| PFBS | 0.0086 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2025 | 1/5 | UCMR-5 |
| Pfhpa | 0.0081 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2025 | 1/5 | UCMR-5 |
| PFOS | 0.0069 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2025 | 1/5 | UCMR-5 |
| PFHXS | 0.0042 µg/L No EPA limit set Main supplier: CITY OF WESTMINSTER · 35,256 people · 2025 | 1/5 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF WESTMINSTER · 35,256 people · 2024
Highest in the city: 0.0022 mg/L — BARK HILL BIBLE CHURCH · 163 people · 2025 | 5/5 | LCR |
| Toxaphene | 0.0019 µg/L 0.1% of the EPA limit 3 µg/L Highest in the city: PLEASANT VALLEY · 150 people · 2019 | 1/5 | SYR4 |
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 Westminster
| Supplier | Population served |
|---|---|
| CITY OF WESTMINSTER | 35,256 |
| FREEDOM DISTRICT | 24,867 |
| WAKEFIELD VALLEY | 2,436 |
| BARK HILL BIBLE CHURCH | 163 |
| PLEASANT VALLEY | 150 |
Frequently asked questions about Westminster tap water
Is Westminster tap water safe to drink?
EPA testing detected 35 contaminants in the water serving Westminster. 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 Westminster?
5 public water suppliers report drinking-water monitoring for Westminster, Maryland to the EPA. Each is listed above with its population served.
What contaminants are in Westminster's water?
The contaminants EPA monitoring detected in Westminster include Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Barium. 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.