Is St. Leonard, MD Tap Water Safe? Quality & Contaminants

What was found in St. Leonard'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
Fluoride	300 µg/L 7.5% of the EPA limit 4000 µg/L Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2019	1/1	SYR4
Nitrate	200 µg/L 2% of the EPA limit 10000 µg/L Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2019	1/1	SYR4
Gross Beta Particle Activity	13.1 pCi/L No EPA limit set Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2012	1/1	SYR4
Arsenic	12.93 µg/L 129% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2019	1/1	SYR4
TTHM	4.8375 µg/L 6% of the EPA limit 80 µg/L Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	2.486 µg/L 4.1% of the EPA limit 60 µg/L Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2019	1/1	SYR4
Chloroform	2.0715 µg/L No EPA limit set Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2019	1/1	SYR4
Dichloroacetic Acid	1.693 µg/L No EPA limit set Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2014	1/1	SYR4
Bromodichloromethane	1.5185 µg/L No EPA limit set Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2019	1/1	SYR4
Dibromochloromethane	1.093 µg/L No EPA limit set Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2019	1/1	SYR4
Trichloroacetic Acid	1 µg/L No EPA limit set Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2014	1/1	SYR4
Lead	0.0015 mg/L 10% of the EPA limit 0.0150 mg/L Main supplier: BEACHES WATER CO-OPERATIVE · 2,000 people · 2025	1/1	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 St. Leonard

Supplier	Population served
BEACHES WATER CO-OPERATIVE	2,000

Frequently asked questions about St. Leonard tap water

Is St. Leonard tap water safe to drink?

EPA testing detected 12 contaminants in the water serving St. Leonard. 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 St. Leonard?

1 public water supplier report drinking-water monitoring for St. Leonard, Maryland to the EPA. Each is listed above with its population served.

What contaminants are in St. Leonard's water?

The contaminants EPA monitoring detected in St. Leonard include Fluoride, Nitrate, Gross Beta Particle Activity, Arsenic, 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.