PlainWater
Counties → Maryland

Montgomery County, Maryland

Water Systems
56
Population Served
1,971,831
Total Violations
1,796
495 health-based
PFAS Detected
3
of 3 tested

Violation Analysis

87.5%
Systems with Violations
32.1
Avg Violations per System
27.6%
Health-Based Violations

Water Source Types

GW
41 systems (73%)
SW
9 systems (16%)

PFAS Contamination

3
Systems Tested
3
PFAS Detected
100.0%
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

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

No violations on record (7) One or more violations (43)

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
Washington Suburban Sanitary Commission 1,900,000 2 Detected
City of Rockville 52,000 220 Detected
Town of Poolesville 6,005 144 Detected
Adventist Healthcare Shady Grove Med Ctr 2,100 0 -
Suburban Hospital 1,900 0 -
Fairland Crossing Apartments 1,248 0 -
National Institutes of Health 1,100 0 -
Glenstone Foundation 537 6 -
Dickerson Market 510 17 -
Darnestown Swim and Raquet Club 470 13 -
The Barnesville School 440 59 -
Smokey Glen Farm - Picnic Pavillion 400 17 -
Smokey Glen Farm- Grove Area 400 2 -
Monocacy Elementary School 351 41 -
Whitley Park Condominiums 256 0 -
Comus Inn 256 12 -
Montgomery Country Club 200 11 -
Old Anglers Inn 200 5 -
Laytonsville Golf Course- Clubhouse 200 31 -
Little Bennett Golf Course-Clubhouse 200 19 -
Boyds Presb and Elf School,camp Sunshine 180 13 -
Brooke Grove Retirement Village 170 0 -
Butler School 169 68 -
Mater Amoris Montessori School 155 31 -
N.i.h. Animal Center 150 25 -
T.w. Enterprize and Texs Carryout 138 40 -
Glenvilah Center I [12944 A-E] 138 24 -
Ruppert Landscape 119 21 -
Whites Ferry Store 115 25 -
Empire Cafe 105 16 -
Bretton Woods Recreation Center 100 11 -
Potomac Swim and Tennis 100 29 -
Sunshine General Store 100 115 -
Tri-County Baptist Church 100 13 -
Glenvilah Center II [12948 A-F] 93 101 -
Camp Bennett Lodge [Union Mission] 80 28 -
Cedar Grove Beer and Wine 80 16 -
Etchison Country Store 80 32 -
Camp Bennett Office/[Union Mission] 80 2 -
Pleasants Excavation Co., Inc. 75 92 -
New Hope Presbyterian/Clc Preschool 71 17 -
Denise Bakery 70 42 -
Montgomery Co Resource Recovery Facility 64 7 -
Seneca Academy & the Circle School 60 25 -
C.s.a.a.c. - Brookeville School Campus 60 14 -
Glenvilah Center III [12960- 12964] 50 16 -
St. Marys Church 50 1 -
Little Bennett- Driving Range 50 24 -
Poolesville Public Golf Club 40 26 -
Dayspring Church - Wellspring Well 37 0 -

Other Counties in Maryland

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
Frederick County
220 systems · 215,362 served · 3,555 violations
Charles County
171 systems · 143,656 served · 3,860 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Montgomery County? ▼
Montgomery County has 1,796 total drinking water violations across 56 water systems, of which 495 are health-based violations. 87.5% of systems have at least one violation.
How many people get water from Montgomery County systems? ▼
Water systems in Montgomery County serve approximately 1,971,831 people through 56 public water systems.
Has PFAS been detected in Montgomery County water? ▼
Of 3 water systems tested for PFAS in Montgomery County, 3 had PFAS detected (100.0% detection rate).
What types of water sources supply Montgomery County? ▼
Water systems in Montgomery County use GW (41 systems), SW (9 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. 27.6% of Montgomery 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.