What's in Caroline County, VA tap water?
Caroline County sits about 60 miles from our Arlington base and is served primarily by Milford Sanitary District, which provides water to roughly 1,120 people. It draws from the Potomac River watershed. Most of the DC metro area drinks treated Potomac River water. Because that surface water is heavily disinfected to stay safe across a long distribution system, the contaminants that most often exceed EWG's stricter health guidelines here are chlorination byproducts, alongside unregulated contaminants like PFAS and hexavalent chromium.
Find a local installerMilford Sanitary District water quality report, explained
What testing of Milford Sanitary District water shows for Caroline County, compared with EWG's health guidelines. Being above a guideline is not a legal violation.
Primary water system (EPA)
Milford Sanitary District
Serves about 1,120 people
Contaminants EWG most often flags above its health guidelines for the Potomac River watershed:
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 · Caroline County, VA
Caroline County, VA tap water is fully legal.
It is also 7× the health standard for lead.
Caroline County draws its water from the ground rather than from a river, through a small system serving about 1,117 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)
Milford Sanitary District was not part of the EPA's most recent national PFAS monitoring round, so there is no federal PFAS result for it. Nobody has looked, which is not the same as nothing being there. Lead sampling put the ninetieth percentile at 1.4 ppb — meaning nine in ten homes tested below that, and one in ten above it. It has no violations on file.
Milford Sanitary District, on the EPA's record
- Source
- groundwater
- Connections served
- 325
- People served
- 1,117
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 Milford Sanitary District. 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.
2 contaminants above EWG's health guidelines
Everything EWG found above its guideline in Caroline County's water, from testing in 2018-2024. 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 |
|---|---|---|---|
| Radium, combined (-226 and -228) | 2.44 pCi/L | 0.05 pCi/L | 49× |
| Dibromochloromethane | 0.260 ppb | 0.1 ppb | 2.6× |
Source: EWG Tap Water Database, Caroline Utility System (VA6033085).
The fix for Caroline County water
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Common in U.S. tap water
Caroline County water quality FAQ
Is Caroline County, VA tap water safe to drink?
Public water in Caroline County meets federal EPA legal limits. But "legal" is not the same as "clean": across the Potomac River watershed, independent testing routinely finds contaminants like total trihalomethanes (TTHMs) and haloacetic acids (HAA5) above EWG's stricter health guidelines. Enter your zip code above to see your exact utility's record.
What contaminants are common in Caroline County water?
For the Potomac River watershed, the contaminants that most often exceed health guidelines are total trihalomethanes (TTHMs), haloacetic acids (HAA5), hexavalent chromium (chromium-6), PFAS (forever chemicals) and lead (from older service lines). Your specific levels depend on your utility, which you can look up by zip code above.
Does Sanavia install reverse osmosis systems in Caroline County?
Yes. Caroline County is roughly 60 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 Caroline County tap water come from?
Caroline County's primary public water system is Milford Sanitary District, which serves roughly 1,120 people. It sits in the Potomac River watershed, 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 Caroline County tested for these contaminants?
No. Private wells are not covered by municipal testing, so the responsibility falls on the homeowner. If your Caroline 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 Potomac River watershed
Each of these is a plain-English guide to a contaminant class common in Caroline County and the surrounding Potomac River watershed — what it is, the health context, and what actually removes it.
Reverse osmosis in Caroline County, VA
Milford Sanitary District treats this water to the federal standard, yet the contaminants listed above still exceed EWG’s stricter health guidelines — Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Hexavalent chromium (chromium-6) 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.
Lead is the one nothing upstream can fix. It does not arrive from the treatment plant; it comes off the service line and the household plumbing in between, which is why two houses on the same street test differently. A reverse osmosis membrane sits at the end of that run, after every pipe the water has already passed through.
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Full testing record for Caroline County · Find a local installer
Detailed city water reports
For the largest DC-metro utilities we publish the full measured contaminant table.
Nearby areas we serve
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