What's in Queen Anne's County, MD tap water?
Queen Anne's County sits about 56 miles from our Arlington base and is served primarily by Town of Centreville, which provides water to roughly 3,320 people. It draws from the Coastal-plain aquifers. Maryland's Eastern Shore and Southern Maryland sit on coastal-plain aquifers. That groundwater commonly carries naturally occurring arsenic and radionuclides, iron and manganese, and nitrate from farming, with saltwater intrusion a growing concern near the Chesapeake Bay.
Find a local installerTown of Centreville water quality report, explained
What testing of Town of Centreville water shows for Queen Anne's County, compared with EWG's health guidelines. Being above a guideline is not a legal violation.
Primary water system (EPA)
Town of Centreville
Serves about 3,320 people
Contaminants EWG most often flags above its health guidelines for the Coastal-plain aquifers:
Larger areas have more than one water system. Enter your exact zip code below for your utility's own EPA record and EWG report.
Measured by the EPA · Queen Anne's County, MD
Queen Anne's County, MD tap water is fully legal.
It is also 25× the health standard for lead.
Queen Anne's County draws its water from the ground rather than from a river, through a small system serving about 3,322 people. Well water arrives with whatever the rock it sat in put into it, and small systems test less often than large ones.
Groundwater does not carry the chlorination byproducts that dominate river supplies, because it needs far less disinfection. What it carries instead comes out of the rock: arsenic, radium, manganese, and nitrate where there is farming above the aquifer. Boiling concentrates all of them rather than removing them.
Every federal limit that applies here is met. Those limits weigh what removal costs. EWG says its health standards are “based only on protecting health and does not consider technical feasibility or the cost of water treatment”. Here is how far apart the two are.
Harm to the brain and nervous system · EPA limit 10 ppb (action level, lowered from 15 ppb, in force November 2027)
It was tested for 29 PFAS compounds in the EPA's latest round and none came back above reporting limits — genuinely good news, and a single window in time. Lead sampling put the ninetieth percentile at 5 ppb — meaning nine in ten homes tested below that, and one in ten above it. Town of Centreville has 22 violations on file with the EPA, 1 of them health-based.
Town of Centreville, on the EPA's record
- Source
- groundwater
- Connections served
- 975
- People served
- 3,322
- Violations on file
- 22 (1 health-based)
How this water is treated before it reaches you
Treatment makes water safe to distribute. It is not designed to remove PFAS, and chlorine-based disinfection creates byproducts of its own.
Levels: EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5, 2023–2025) for PFAS, and the Lead and Copper Rule 90th-percentile result for lead and copper — the highest reported for Town of Centreville. Health standards: EWG's published drinking water standards, updated February 2025. Levels vary by sampling point and date, and being above a health standard is not a legal violation.
7 contaminants above EWG's health guidelines
Everything EWG found above its guideline in Queen Anne's County's water, from testing in 2018-2023. A level can be under the legal limit and still be listed here: EWG's guidelines are set to protect health, not to be easy to meet.
| Contaminant | In this water | EWG guideline | Times over |
|---|---|---|---|
| Haloacetic acids (HAA5) | 25.9 ppb | 0.1 ppb | 259× |
| Total trihalomethanes (TTHMs) | 24.1 ppb | 0.15 ppb | 161× |
| Radium, combined (-226 and -228) | 1.06 pCi/L | 0.05 pCi/L | 21× |
| Bromodichloromethane | 1.05 ppb | 0.06 ppb | 18× |
| Bromochloromethane | 0.650 ppb | 0.06 ppb | 11× |
| Chloroform | 1.55 ppb | 0.4 ppb | 3.9× |
| Radon | 4.50 pCi/L | 1.5 pCi/L | 3× |
Source: EWG Tap Water Database, Stevensville (MD0170019).
The fix for Queen Anne's County water
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Reverse osmosis under your sink, for the contaminants EWG most often flags in the Coastal-plain aquifers.
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Common in U.S. tap water
Queen Anne's County water quality FAQ
Is Queen Anne's County, MD tap water safe to drink?
Public water in Queen Anne's County meets federal EPA legal limits. But "legal" is not the same as "clean": across the Coastal-plain aquifers, independent testing routinely finds contaminants like arsenic (naturally occurring) and radium & radionuclides (naturally occurring) above EWG's stricter health guidelines. Enter your zip code above to see your exact utility's record.
What contaminants are common in Queen Anne's County water?
For the Coastal-plain aquifers, the contaminants that most often exceed health guidelines are arsenic (naturally occurring), radium & radionuclides (naturally occurring), nitrates (agricultural runoff), PFAS (forever chemicals) and total trihalomethanes (where chlorinated). Your specific levels depend on your utility, which you can look up by zip code above.
Does Sanavia install reverse osmosis systems in Queen Anne's County?
Yes. Queen Anne's County is roughly 56 miles from our Arlington base and inside our service area. A Sanavia Hydra reverse osmosis system installs under your sink and reduces every contaminant class above, and we'll mail you a free water test kit.
Where does Queen Anne's County tap water come from?
Queen Anne's County's primary public water system is Town of Centreville, which serves roughly 3,320 people. It sits in the Coastal-plain aquifers, so its water shares that region's contaminant profile. Larger areas may have more than one utility, so enter your exact zip code above for your own system's EPA record.
Is well water in Queen Anne's County tested for these contaminants?
No. Private wells are not covered by municipal testing, so the responsibility falls on the homeowner. If your Queen Anne's County home is on a well, nitrate and naturally occurring contaminants are worth testing for specifically, and a reverse osmosis system reduces them at the tap. We'll mail you a free water test kit either way.
Contaminants common in the Coastal-plain aquifers
Each of these is a plain-English guide to a contaminant class common in Queen Anne's County and the surrounding Coastal-plain aquifers — what it is, the health context, and what actually removes it.
Reverse osmosis in Queen Anne's County, MD
Town of Centreville treats this water to the federal standard, yet the contaminants listed above still exceed EWG’s stricter health guidelines — Arsenic (naturally occurring), Radium & radionuclides (naturally occurring), Nitrates (agricultural runoff) and 2 more. Most of them either pass straight through treatment or form after the plant, in the pipes between it and the tap, which is why the fix has to be at the tap as well.
PFAS is the reason a carbon pitcher is not enough here. The compounds do not break down, they are measured in parts per trillion, and the federal limit that covers them is not enforceable until 2029. A reverse osmosis membrane is one of the few things at household scale that reduces them rather than passing them through.
Fit it yourself
$999, under the sink, with the included instructions.
We fit it for you
$1,250 installed in Queen Anne's County.
Full testing record for Queen Anne's County · Find a local installer
Detailed city water reports
For the largest DC-metro utilities we publish the full measured contaminant table.
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