What's in Manassas Park City, VA tap water?
Manassas Park City sits about 19 miles from our Arlington base and is served primarily by Manassas Park, City Of, which provides water to roughly 14,100 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 installerCity of Manassas Park water quality report, explained
What testing of City of Manassas Park water shows for Manassas Park City, compared with EWG's health guidelines. Being above a guideline is not a legal violation.
Primary water system (EPA)
Manassas Park, City Of
Serves about 14,100 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 · Manassas Park City, VA
Manassas Park City is served by Manassas Park, City of, a surface-water system supplying roughly 14,051 people. It treats its own water rather than buying it from a regional wholesaler, so what comes out of the tap is its work end to end.
Surface water needs heavy disinfection, and chlorine reacting with organic matter in the river is what creates trihalomethanes and haloacetic acids. Those are the contaminants that most often sit above health guidelines here, and they form in the pipes after treatment rather than at the plant.
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 fetal growth and child development · no federal limit exists
Harm to fetal growth and child development · no federal limit exists
The EPA's latest round found 2 PFAS compounds in this supply. No lead or copper results appear in EPA's published record for this system.
Manassas Park, City of, on the EPA's record
- Source
- surface water
- Connections served
- 4,050
- People served
- 14,051
- Violations on file
- 2, none health-based
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 Manassas Park, City of. 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.
10 contaminants above EWG's health guidelines
Everything EWG found above its guideline in Manassas Park City's water, from testing in 2014-2024. 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 |
|---|---|---|---|
| Haloacetic acids (HAA9) | 24.7 ppb | 0.06 ppb | 412× |
| Total trihalomethanes (TTHMs) | 30.5 ppb | 0.15 ppb | 204× |
| Haloacetic acids (HAA5) | 16.8 ppb | 0.1 ppb | 168× |
| Bromodichloromethane | 6.25 ppb | 0.06 ppb | 104× |
| Trichloroacetic acid | 7.06 ppb | 0.1 ppb | 71× |
| Chloroform | 21.9 ppb | 0.4 ppb | 55× |
| Dichloroacetic acid | 9.06 ppb | 0.2 ppb | 45× |
| Dibromochloromethane | 2.32 ppb | 0.1 ppb | 23× |
| Chromium (hexavalent) | 0.0902 ppb | 0.02 ppb | 4.5× |
| Dibromoacetic acid | 0.0625 ppb | 0.03 ppb | 2.1× |
Source: EWG Tap Water Database, Manassas Park, City Of (VA6687100).
The fix for Manassas Park City water
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Common in U.S. tap water
Manassas Park City water quality FAQ
Is Manassas Park City, VA tap water safe to drink?
Public water in Manassas Park City 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 Manassas Park City 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 Manassas Park City?
Yes. Manassas Park City is roughly 19 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 offer a free in-home water test.
Where does Manassas Park City tap water come from?
Manassas Park City's primary public water system is Manassas Park, City Of, which serves roughly 14,100 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 Manassas Park City tested for these contaminants?
No. Private wells are not covered by municipal testing, so the responsibility falls on the homeowner. If your Manassas Park City 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 offer a free in-home water test either way.
Contaminants common in the Potomac River watershed
Each of these is a plain-English guide to a contaminant class common in Manassas Park City and the surrounding Potomac River watershed — what it is, the health context, and what actually removes it.
Reverse osmosis in Manassas Park City, VA
Manassas Park, City of 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 Manassas Park City · Find a local installer
Further reading for Manassas Park City
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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