City of Frederick water quality
Frederick, MD · serves 54,000 people (16,600 connections) · Surface water · Local government · EPA ID MD0100015
Data: U.S. EPA · How we read the data · How we check it
Buys water from New Design – Frederick County Water System. Treated water bought from another system can carry that system's contaminants.
Summary
No federal limits exceeded in EPA data.
- PFAS
- Detected, below limit1 of 29 PFAS found at least once. All averages below the federal limits.
- Lead
- Below action level1.1 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2021. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read City of Frederick's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (301) 600-1754. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 4 entry points tested Mar 2024 to Dec 2024. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Not detected Limit 1 | – |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
| PFPeA Detected, no limit | 0.78 ppt |
29 PFAS tested, 1 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Not detected in 16 samples (reporting limit 9 ppb). About lithium.
Lead and copper
Latest 90th percentile: 1.1 ppb lead (Jan 2019 – Dec 2021). Below action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2019 – Dec 2021 | 1.1 ppb |
| Jan 2016 – Dec 2018 | 0 ppb |
| Jan 2013 – Dec 2015 | 1.21 ppb |
Earlier results (9)
| Jan 2010 – Dec 2012 | 2 ppb |
| Jan 2007 – Dec 2009 | 1 ppb |
| Jul 2006 – Dec 2006 | 2 ppb |
| Jan 2006 – Jun 2006 | 2 ppb |
| Jan 2000 – Dec 2002 | 4 ppb |
| Jan 1997 – Dec 1999 | 2 ppb |
| Jan 1996 – Dec 1998 | 4 ppb |
| Jan 1995 – Dec 1995 | 3 ppb |
| Jan 1994 – Dec 1994 | 0 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 9.5 ppb | 300 ppb |
| Vanadium | 0.88 ppb | 21 ppb |
| Chlorate | 139 ppb | 210 ppb |
| Chromium-6 | 0.5 ppb | – |
| Strontium | 0.29 ppm | 1.5 ppm |
Where it serves
ZIP codes the system reported serving: 21701, 21702, 21703
Nearby utilities
- New Design – Frederick County Water System Frederick · same area
- Town of Middletown Middletown · 6 mi · PFAS above limit
- Town of Thurmont Thurmont · 13 mi · PFAS above limit
- Town of Mount Airy Mount Airy · 14 mi · PFAS above limit
- Town of Poolesville Poolesville · 20 mi · PFAS above limit
- City of Taneytown Taneytown · 20 mi · PFAS above limit
Questions
Is City of Frederick water safe to drink?
City of Frederick has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does City of Frederick water have PFAS?
Yes. EPA's 2023–2025 testing of City of Frederick found 1 PFAS at least once. None of the averages were above the federal limits.
What is the lead level in City of Frederick water?
The most recent 90th-percentile lead result for City of Frederick is 1.1 ppb, for the period ending Dec 2021. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for MD0100015: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID MD0100015).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask City of Frederick at (301) 600-1754, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.