What's in Manassas City, VA tap water?
Manassas City sits about 22 miles from our Arlington base and is served primarily by Manassas, City Of, which provides water to roughly 42,700 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 water quality report, explained
What testing of City of Manassas water shows for Manassas City, compared with EWG's health guidelines. Being above a guideline is not a legal violation.
Primary water system (EPA)
Manassas, City Of
Serves about 42,700 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 City, VA
Manassas City, VA tap water is fully legal.
It is also 2.4× the health standard for lead.
Manassas City is served by Manassas, City of, a surface-water system supplying roughly 42,696 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.
River water has to be disinfected hard enough to stay safe across the whole network, and this system uses chloramines rather than free chlorine. Chloramine is more stable in long pipe runs and produces fewer trihalomethanes — but it is more corrosive to old plumbing, which is precisely how lead gets into water that left the plant clean.
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)
Harm to fetal growth and child development · no federal limit exists
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 3 PFAS compounds in this supply. Lead sampling put the ninetieth percentile at 0.47 ppb — meaning nine in ten homes tested below that, and one in ten above it.
Manassas, City of, on the EPA's record
- Source
- surface water
- Connections served
- 11,385
- People served
- 42,696
- Violations on file
- 1, none 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 Manassas, 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 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) | 30.4 ppb | 0.06 ppb | 507× |
| Haloacetic acids (HAA5) | 28.1 ppb | 0.1 ppb | 281× |
| Total trihalomethanes (TTHMs) | 41.5 ppb | 0.15 ppb | 276× |
| Trichloroacetic acid | 13.3 ppb | 0.1 ppb | 133× |
| Bromodichloromethane | 7.49 ppb | 0.06 ppb | 125× |
| Chloroform | 32.6 ppb | 0.4 ppb | 81× |
| Dichloroacetic acid | 14.4 ppb | 0.2 ppb | 72× |
| Toxaphene | 0.893 ppb | 0.03 ppb | 30× |
| Dibromochloromethane | 1.38 ppb | 0.1 ppb | 14× |
| Chromium (hexavalent) | 0.0463 ppb | 0.02 ppb | 2.3× |
Source: EWG Tap Water Database, Manassas, City Of (VA6685100).
The fix for Manassas City water
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Common in U.S. tap water
Manassas City water quality FAQ
Is Manassas City, VA tap water safe to drink?
Public water in Manassas 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 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 City?
Yes. Manassas City is roughly 22 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 City tap water come from?
Manassas City's primary public water system is Manassas, City Of, which serves roughly 42,700 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 City tested for these contaminants?
No. Private wells are not covered by municipal testing, so the responsibility falls on the homeowner. If your Manassas 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 City and the surrounding Potomac River watershed — what it is, the health context, and what actually removes it.
Reverse osmosis in Manassas City, VA
Manassas, 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 City · Find a local installer
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