What's in Harford County, MD tap water?
Harford County sits about 63 miles from our Arlington base and is served primarily by Harford County (Greenridge area), which provides water to roughly 2,270 people. It draws from the Piedmont reservoirs, rivers & wells. Piedmont and northern-Maryland communities draw from a mix of reservoirs, rivers (including the Susquehanna and Monocacy) and groundwater wells. Chlorination byproducts plus agricultural and industrial runoff drive most of the contaminants that exceed EWG's health guidelines.
Find a local installerHarford County (Greenridge area) water quality report, explained
What testing of Harford County (Greenridge area) water shows for Harford County, compared with EWG's health guidelines. Being above a guideline is not a legal violation.
Primary water system (EPA)
Harford County (Greenridge area)
Serves about 2,270 people
Contaminants EWG most often flags above its health guidelines for the Piedmont reservoirs, rivers & wells:
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 · Harford County, MD
Harford County, MD tap water is fully legal.
It is also 6.2× the health standard for copper.
Harford County is served by Greenridge Subdivision, a surface-water system supplying roughly 2,271 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.
Diarrhea; weight loss; vomiting · no federal limit exists
Greenridge Subdivision 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. No lead or copper results appear in EPA's published record for this system. It carries 5 violations on file, none health-based — monitoring and reporting lapses rather than contamination.
Greenridge Subdivision, on the EPA's record
- Source
- surface water
- Connections served
- 845
- People served
- 2,271
- Violations on file
- 5, 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 Greenridge Subdivision. 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.
11 contaminants above EWG's health guidelines
Everything EWG found above its guideline in Harford County's water, from testing in 2013-2024. 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) | 30.9 ppb | 0.06 ppb | 514× |
| Haloacetic acids (HAA5) | 18.8 ppb | 0.1 ppb | 188× |
| Total trihalomethanes (TTHMs) | 24.3 ppb | 0.15 ppb | 162× |
| Bromodichloromethane | 5.43 ppb | 0.06 ppb | 91× |
| Chloroform | 23.5 ppb | 0.4 ppb | 59× |
| Arsenic | 0.0833 ppb | 0.004 ppb | 21× |
| Nitrate | 2.87 ppm | 0.14 ppm | 21× |
| Radium, combined (-226 and -228) | 1.07 pCi/L | 0.05 pCi/L | 21× |
| Chromium (hexavalent) | 0.333 ppb | 0.02 ppb | 17× |
| Nitrate and nitrite | 2.32 ppm | 0.14 ppm | 17× |
| Dibromochloromethane | 1.33 ppb | 0.1 ppb | 13× |
Source: EWG Tap Water Database, Harford County Department of Public Works (MD0120016).
The fix for Harford County water
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Reverse osmosis under your sink, for the contaminants EWG most often flags in the Piedmont reservoirs, rivers & wells.
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Common in U.S. tap water
Harford County water quality FAQ
Is Harford County, MD tap water safe to drink?
Public water in Harford County meets federal EPA legal limits. But "legal" is not the same as "clean": across the Piedmont reservoirs, rivers & wells, 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 Harford County water?
For the Piedmont reservoirs, rivers & wells, the contaminants that most often exceed health guidelines are total trihalomethanes (TTHMs), haloacetic acids (HAA5), nitrates (agricultural runoff), hexavalent chromium (chromium-6) and PFAS (forever chemicals). Your specific levels depend on your utility, which you can look up by zip code above.
Does Sanavia install reverse osmosis systems in Harford County?
Yes. Harford County is roughly 63 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 Harford County tap water come from?
Harford County's primary public water system is Harford County (Greenridge area), which serves roughly 2,270 people. It sits in the Piedmont reservoirs, rivers & wells, 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 Harford County tested for these contaminants?
No. Private wells are not covered by municipal testing, so the responsibility falls on the homeowner. If your Harford 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 Piedmont reservoirs, rivers & wells
Each of these is a plain-English guide to a contaminant class common in Harford County and the surrounding Piedmont reservoirs, rivers & wells — what it is, the health context, and what actually removes it.
Reverse osmosis in Harford County, MD
Harford County (Greenridge Area) 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), 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
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Full testing record for Harford County · Find a local installer
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