Is Annapolis, MD Tap Water Safe? Quality & Contaminants

What was found in Annapolis'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	695.9 µg/L 17% of the EPA limit 4000 µg/L Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2017	3/4	SYR4
TTHM	9.6995 µg/L 12% of the EPA limit 80 µg/L Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2019 Highest in the city: 19.58 µg/L — U.S. NAVAL ACADEMY · 8,700 people · 2019	2/4	SYR4
Barium	17.42 µg/L 0.9% of the EPA limit 2000 µg/L Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2017	1/4	SYR4
Lithium	12.1 µg/L No EPA limit set Highest in the city: U.S. NAVAL ACADEMY · 8,700 people · 2024	1/4	UCMR-5
Arsenic	6.155 µg/L 62% of the EPA limit 10 µg/L Highest in the city: MAYO CENTER AND APARTMENTS · 60 people · 2019	1/4	SYR4
Chloroform	5.346 µg/L No EPA limit set Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2016	2/4	SYR4
Total Haloacetic Acids (HAA5)	1.382 µg/L 2.3% of the EPA limit 60 µg/L Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2019 Highest in the city: 3.268 µg/L — U.S. NAVAL ACADEMY · 8,700 people · 2019	2/4	SYR4
Bromodichloromethane	2.73 µg/L No EPA limit set Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2016	2/4	SYR4
Dibromochloromethane	1.796 µg/L No EPA limit set Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2016	2/4	SYR4
Dichloroacetic Acid	1.398 µg/L No EPA limit set Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2015 Highest in the city: 1.68 µg/L — U.S. NAVAL ACADEMY · 8,700 people · 2014	2/4	SYR4
Chlorobenzene	0.9400 µg/L 0.9% of the EPA limit 100 µg/L Highest in the city: MAYO CENTER AND APARTMENTS · 60 people · 2019	1/4	SYR4
Lead	0.0063 mg/L 42% of the EPA limit 0.0150 mg/L Main supplier: CITY OF ANNAPOLIS · 35,000 people · 2023	4/4	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 Annapolis

Supplier	Population served
CITY OF ANNAPOLIS	35,000
U.S. NAVAL ACADEMY	8,700
MAYO CENTER AND APARTMENTS	60
TENTHOUSE CREEK COMMUNITY - ACDS	23

Frequently asked questions about Annapolis tap water

Is Annapolis tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Annapolis. 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 Annapolis?

4 public water suppliers report drinking-water monitoring for Annapolis, Maryland to the EPA. Each is listed above with its population served.

What contaminants are in Annapolis's water?

The contaminants EPA monitoring detected in Annapolis include Fluoride, TTHM, Barium, Lithium, Arsenic. 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.