Frederick, MD (21705): High Radon Potential Area
EPA data for City of Frederick
EPA records for the water systems mapped to 21705 in Frederick, MD contain zero recorded violations for inclusive record years 2021 through 2026. This does not establish that every category was monitored or published, and it does not cover events outside that source window.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water No drinking-water violations in EPA records since 2021.
- Lead The reported 90th-percentile lead result of 0.0011 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
- PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
- Radon EPA Zone 1 - highest county-level potential. This is not a home measurement; test before any threshold comparison.
Get updates when new water-quality data is available for your area
Free alerts when new EPA data affects ZIP code 21705. No spam - just safety updates.
Unsubscribe anytime. We only send updates when your safety score changes. See our Privacy Policy.
See incorrect data? Let us know
The compiled record for Frederick (21705) yields 1 high-priority finding; critical-level alerts are absent from the same data.
Score Breakdown
Overall Home Safety Score: Score unavailable
Required evidence is missing. Missing values remain unknown and are not imputed or renormalized.
Canonical components
Required domains
Coverage: 3 of 4 components and 2 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (8) HIGH
Your Water System
ZIP code 21705 in Frederick, Maryland is mapped to the water system City of Frederick (EPA ID: MD0100015). This system provides water to approximately 54,000 people from surface water sources.
Other Water Quality Reports in Maryland
- 20588 (Dhs)
- 20601 (Waldorf) - 3 violations recorded for mapped water systems
- 20602 (Waldorf) - 3 violations recorded for mapped water systems
- 20603 (Waldorf) - 3 violations recorded for mapped water systems
- 20604 (Waldorf)
- 20606 (Abell)
- 20607 (Accokeek) - 3 violations recorded for mapped water systems
- 20608 (Aquasco)
- 20609 (Avenue)
- 20610 (Barstow)
- 20611 (Bel Alton) - 3 violations recorded for mapped water systems
- 20612 (Benedict)
- 20613 (Brandywine) - 2 violations recorded for mapped water systems
- 20615 (Broomes Island)
- 20616 (Bryans Road) - 1 violation recorded for mapped water systems
- 20617 (Bryantown)
- 20618 (Bushwood)
- 20619 (California) - 12 violations recorded for mapped water systems
- 20620 (Callaway) - 1 violation recorded for mapped water systems
- 20621 (Chaptico) - 4 violations recorded for mapped water systems
Nearby Water Quality Reports
- 21709 (Frederick) - 4 mi
- 21703 (Frederick) - 4 mi - 2 violations recorded for mapped water systems
- 21701 (Frederick) - 5 mi - 3 violations recorded for mapped water systems
- 21704 (Frederick) - 5 mi - 2 violations recorded for mapped water systems
- 21714 (Braddock Heights) - 5 mi
- 21793 (Walkersville) - 6 mi - 8 violations recorded for mapped water systems
- 21717 (Buckeystown) - 6 mi
- 21702 (Frederick) - 6 mi - 4 violations recorded for mapped water systems
- 21774 (New Market) - 7 mi - 2 violations recorded for mapped water systems
- 21769 (Middletown) - 8 mi - 2 violations recorded for mapped water systems
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Frederick (MD0100015) on EPA.gov.
4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 21705.
Detected compounds: PFPeA.
Highest measured level: 0.0031 µg/L
Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.
Environmental Hazards (9) CRITICAL
Home & Infrastructure (4) OK
Cost & Community (7) OK
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Frequently Asked Questions
Is the tap water in 21705 safe to drink?
EPA SDWIS records 0 violations since 2021 across the water systems mapped to ZIP 21705 (primary system: City of Frederick), including 0 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 21705's water come from?
The recorded water source for City of Frederick, a system mapped to ZIP code 21705, is Surface water. This system serves approximately 54,000 people.
How can I get my water tested in Frederick?
If City of Frederick supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
Is lead a concern in 21705 tap water?
The Lead and Copper Rule record selected for 21705 reports a 90th-percentile lead result of 0.0011 mg/L for a water system mapped to this ZIP (record date 2021-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.
What is the radon risk for 21705?
21705 is mapped to a county in EPA Radon Zone 1 (high county-level radon potential; EPA recommends testing every home), located in Frederick County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
Are there PFAS (forever chemicals) in 21705's water?
Yes, PFAS have been detected in samples from water systems mapped to 21705. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.
How to cite this page
ZipCheckup. (2026). Frederick, MD (21705): High Radon Potential Area. https://zipcheckup.com/report/21705/
@misc{zipcheckup-report-21705,
author = {{ZipCheckup}},
title = {{Frederick, MD (21705): High Radon Potential Area}},
year = {2026},
url = {https://zipcheckup.com/report/21705/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 21705
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 21709 | Frederick, MD | 4.0 mi | N/A | 0 |
| 21703 | Frederick, MD | 4.4 mi | D | 2 |
| 21701 | Frederick, MD | 4.6 mi | C | 3 |
| 21704 | Frederick, MD | 5.0 mi | C | 2 |
| 21714 | Braddock Heights, MD | 5.1 mi | N/A | 0 |
| 21793 | Walkersville, MD | 5.5 mi | C | 8 |
| 21717 | Buckeystown, MD | 5.8 mi | N/A | 0 |
| 21702 | Frederick, MD | 6.0 mi | C | 4 |
| 21774 | New Market, MD | 7.2 mi | C | 2 |
| 21769 | Middletown, MD | 7.7 mi | D | 2 |
Nearby ZIP Code Reports
2026 Rankings for Your Area
Overall safety breakdown
Home Safety Score →Find the right water filter
Water Filter Matcher →Compare filters, tests & services
Compare My Options →Compare with another ZIP
Compare Tool →2026 Rankings