PlainWater
Counties → Maryland

Frederick County, Maryland

Water Systems
220
Population Served
215,362
Total Violations
3,555
1,489 health-based
PFAS Detected
6
of 8 tested

Violation Analysis

71.4%
Systems with Violations
16.2
Avg Violations per System
41.9%
Health-Based Violations

Water Source Types

GW
36 systems (16%)
SW
14 systems (6%)

PFAS Contamination

8
Systems Tested
6
PFAS Detected
75.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Frederick Maryland water systems by violation status, EPA SDWIS records.

No violations on record (14) One or more violations (36)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
New Design - Frederick County 74,911 28 Detected
City of Frederick 54,000 11 Detected
Town of Walkersville 8,440 34 Clean
Fort Detrick 7,900 109 Detected
City of Brunswick 7,312 17 Clean
Town of Thurmont 6,200 99 Detected
Town of Middletown 4,288 37 Detected
Fountaindale South 2,610 4 -
McDonalds 2,499 26 -
Town of Emmitsburg 2,400 66 -
I-70 Rest Areas (Eastside and Westside) 2,000 0 -
Mount Saint Marys University 1,900 166 -
Linganore High School 1,722 22 -
Knolls of Windsor 1,553 0 -
Town of Myersville 1,516 21 -
Waterside 1,509 0 -
Sam Hill Estates 1,036 2 -
Cambridge Farms 953 0 -
Dunkin Donuts -Jefferson 908 0 -
Cloverhill 3 - Consecutive to Md0100015 888 39 -
Town of Woodsboro 846 75 -
Mountaindale Convenience Store # 2 812 0 -
Mary Miller LLC 780 0 -
Catoctin Mountain Nat. Park-Misty Mount 668 1 -
Kemptown Elementary 623 31 -
Jefferson Market 606 13 -
Drcc-Damascus Road Community Church 600 0 -
Mountain View Community Church 600 16 -
Cunningham Falls - Houck Area 577 0 -
Catoctin Wildlife Preserve & Zoo 575 17 -
7- Eleven - (Gasmart of Frederick) 500 1 -
Urbana Convenience Shop (Exxon) 500 4 -
Yellow Springs Elementary 486 36 -
Liberty Elementary 466 20 -
St. Ignatius of Loyola Catholic Church 455 0 -
7-Eleven- Thurmont#28960 450 15 -
Bar T Mountainside 450 7 -
Christian Life Center 450 3 -
Green Meadows Petting Farm 400 0 -
Urbana Vfd 355 3 -
Carroll Fuel (Urbana Pike) 350 14 -
Copperfield 338 0 -
Summit Lake Camp 316 1 -
Glenn Ellen Farm 300 0 -
Country Meadows of Frederick 295 22 -
Camp Airy, Lil Strauss Found 294 0 -
Lewistown Elementary 267 23 -
Frederick Baptist Church & School 267 10 -
White Rock 256 7 -
Skycroft Baptist Conerence Center 250 7 -

Other Counties in Maryland

Montgomery County
56 systems · 1,971,831 served · 1,796 violations
Baltimore city County
13 systems · 1,608,056 served · 122 violations
Anne Arundel County
425 systems · 567,204 served · 5,956 violations
Howard County
88 systems · 309,588 served · 985 violations
Harford County
238 systems · 217,578 served · 3,670 violations
Charles County
171 systems · 143,656 served · 3,860 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Frederick County? ▼
Frederick County has 3,555 total drinking water violations across 220 water systems, of which 1,489 are health-based violations. 71.4% of systems have at least one violation.
How many people get water from Frederick County systems? ▼
Water systems in Frederick County serve approximately 215,362 people through 220 public water systems.
Has PFAS been detected in Frederick County water? ▼
Of 8 water systems tested for PFAS in Frederick County, 6 had PFAS detected (75.0% detection rate).
What types of water sources supply Frederick County? ▼
Water systems in Frederick County use GW (36 systems), SW (14 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 41.9% of Frederick County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.