TOWN OF MOUNT AIRY

Q: Is TOWN OF MOUNT AIRY water safe to drink?

TOWN OF MOUNT AIRY (PWS ID: MD0060007) has 156 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 7 PFAS compounds found. This system serves 9,890 people using Groundwater sources.

Q: What type of violations does TOWN OF MOUNT AIRY have?

TOWN OF MOUNT AIRY has 156 total violations: 5 health-based violations (MCL exceedances or treatment failures), 151 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Q: Has PFAS been detected in TOWN OF MOUNT AIRY water?

Yes. UCMR5 testing detected 7 PFAS compounds in TOWN OF MOUNT AIRY's water supply: PFHxA, PFBS, PFPeA, PFOS, PFOA, and others. PFAS are persistent "forever chemicals" that do not break down in the environment.

Q: What water source does TOWN OF MOUNT AIRY use?

TOWN OF MOUNT AIRY uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Q: Where does this data come from?

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Reviewed byPlainWater Editorial, Drinking Water Quality Editorial Team · June 3, 2026

PWS ID: MD0060007 · MOUNT AIRY, Maryland 21771

TOWN OF MOUNT AIRY serves 9,890 people in MOUNT AIRY, Maryland using Groundwater water sources. It has 156 recorded EPA violations, including 5 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (7 compounds found).

Water Quality Snapshot: TOWN OF MOUNT AIRY

TOWN OF MOUNT AIRY is a local-owned community water system that delivers drinking water to 9,890 residents in MOUNT AIRY, Maryland (Carroll County) through 3,326 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 156 total violations for this system , of which 5 (3%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 151 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Fluoride, recorded in 10 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 7 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 0.0227 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Maryland, EPA tracks 3,215 public water systems serving 6,070,211 people, with 60,496 cumulative violations and 18,132 health-based violations on record. About 80% of systems in the state carry at least one violation, and state-wide the average per system is 18.8 violations. TOWN OF MOUNT AIRY's 156 violations sit above the Maryland average. Statewide, 50 of 83 UCMR5-tested systems have reported PFAS detections (60.2%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

7 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served

9,890

Total Violations

156

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Local
Connections: 3,326
County: Carroll
School/Daycare: No
MCL Violations: 5
Monitoring Violations: 151
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Fluoride	MR	10	2022
1,2,4-Trichlorobenzene	MR	5	2001
1,2-Dichloroethane	MR	5	2001
1,1,1-Trichloroethane	MR	5	2001
1,2-Dichloropropane	MR	5	2001
1,1,2-Trichloroethane	MR	5	2001
CHLOROBENZENE	MR	5	2001
Benzene	MR	5	2001
Ethylbenzene	MR	5	2001
Styrene	MR	5	2001
Xylenes, Total	MR	5	2001
DICHLOROMETHANE	MR	5	2001
p-Dichlorobenzene	MR	5	2001
Vinyl chloride	MR	5	2001
Trichloroethylene	MR	5	2001
1,1-Dichloroethylene	MR	5	2001
trans-1,2-Dichloroethylene	MR	5	2001
Nitrate	MCL	5	1992
cis-1,2-Dichloroethylene	MR	5	2001
Tetrachloroethylene	MR	5	2001
Toluene	MR	5	2001
o-Dichlorobenzene	MR	5	2001
Carbon tetrachloride	MR	5	2001
Chromium	MR	3	1999
Nickel	MR	3	1999
Antimony, Total	MR	3	1999
Thallium, Total	MR	3	1999
TTHM	MR	3	2010
Mercury	MR	3	1999
Cadmium	MR	3	1999

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 33 of 300 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
PFHxA	6/6/2023	0.0041 µg/L	0.003 µg/L	Detected
PFHpA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxS	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFNA	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOA	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFDoA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFBS	6/6/2023	0.0063 µg/L	0.003 µg/L	Detected
PFUnA	6/6/2023	<0.002 µg/L	0.002 µg/L	Not Detected
11Cl-PF3OUdS	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
9Cl-PF3ONS	6/6/2023	<0.002 µg/L	0.002 µg/L	Not Detected
ADONA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
HFPO-DA	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFDA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFBA	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFHpS	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeS	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
NFDHA	6/6/2023	<0.02 µg/L	0.02 µg/L	Not Detected
PFEESA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeA	6/6/2023	0.0046 µg/L	0.003 µg/L	Detected
PFMPA	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
8:2 FTS	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
6:2 FTS	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
11Cl-PF3OUdS	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFHpS	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
NFDHA	6/6/2023	<0.02 µg/L	0.02 µg/L	Not Detected
PFHpA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFNA	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOA	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFDA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFDoA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeS	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFUnA	6/6/2023	<0.002 µg/L	0.002 µg/L	Not Detected
PFBS	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
9Cl-PF3ONS	6/6/2023	<0.002 µg/L	0.002 µg/L	Not Detected
ADONA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
HFPO-DA	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFBA	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
6:2 FTS	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	6/6/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFMPA	6/6/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFPeA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFEESA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxS	6/6/2023	<0.003 µg/L	0.003 µg/L	Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for TOWN OF MOUNT AIRY.

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID MD0060007 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Maryland Drinking Water Authority

Maryland's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find MD regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest)	Contaminant	Category	Count	EPA Record
2022	Fluoride	MR	10	SDWIS / MD0060007 / 1025
2021	Lead and Copper Rule	MR	1	SDWIS / MD0060007 / 5000
2010	TTHM	MR	3	SDWIS / MD0060007 / 2950
2010	Total Haloacetic Acids (HAA5)	MR	3	SDWIS / MD0060007 / 2456
2001	1,2,4-Trichlorobenzene	MR	5	SDWIS / MD0060007 / 2378
2001	1,2-Dichloroethane	MR	5	SDWIS / MD0060007 / 2980
2001	1,1,1-Trichloroethane	MR	5	SDWIS / MD0060007 / 2981
2001	1,2-Dichloropropane	MR	5	SDWIS / MD0060007 / 2983
2001	1,1,2-Trichloroethane	MR	5	SDWIS / MD0060007 / 2985
2001	CHLOROBENZENE	MR	5	SDWIS / MD0060007 / 2989
2001	Benzene	MR	5	SDWIS / MD0060007 / 2990
2001	Ethylbenzene	MR	5	SDWIS / MD0060007 / 2992
2001	Styrene	MR	5	SDWIS / MD0060007 / 2996
2001	Xylenes, Total	MR	5	SDWIS / MD0060007 / 2955
2001	DICHLOROMETHANE	MR	5	SDWIS / MD0060007 / 2964

How TOWN OF MOUNT AIRY Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric	TOWN OF MOUNT AIRY	Maryland avg	Federal benchmark
Total violations	156	18.8	SDWA compliance — any non-zero count is a recorded breach
Health-based violations	5	5.6	Indicates a contaminant exceeded a federal MCL
PFAS detection	7 compounds	60.2%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	9,890	1,888	Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 3,215 regulated public water systems in Maryland.

Federal MCL reference — Safe Drinking Water Act thresholds ▼

Contaminant	Federal MCL / Action Level	Note
Lead	0 mg/L (Action Level: 0.015 mg/L)	Lead and Copper Rule treatment technique
Arsenic	0.010 mg/L (10 ppb)	Health-based MCL since 2006
Total Coliform	Treatment technique (RTCR)	Indicator organism, monitoring trigger
PFOA / PFOS (PFAS)	4.0 ppt each (final 2024 rule)	Compliance deadline 2029
Nitrate (as N)	10 mg/L	Acute health risk for infants

Frequently Asked Questions

Is TOWN OF MOUNT AIRY water safe to drink? ▼

TOWN OF MOUNT AIRY (PWS ID: MD0060007) has 156 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 7 PFAS compounds found. This system serves 9,890 people using Groundwater sources.

How many people does TOWN OF MOUNT AIRY serve? ▼

TOWN OF MOUNT AIRY serves 9,890 people in MOUNT AIRY, Maryland. It is a Local-owned system using Groundwater water sources with 3,326 service connections.

What type of violations does TOWN OF MOUNT AIRY have? ▼

TOWN OF MOUNT AIRY has 156 total violations: 5 health-based violations (MCL exceedances or treatment failures), 151 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in TOWN OF MOUNT AIRY water? ▼

Yes. UCMR5 testing detected 7 PFAS compounds in TOWN OF MOUNT AIRY's water supply: PFHxA, PFBS, PFPeA, PFOS, PFOA, and others. PFAS are persistent "forever chemicals" that do not break down in the environment.

What water source does TOWN OF MOUNT AIRY use? ▼

TOWN OF MOUNT AIRY uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Where does this data come from? ▼

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Explore PlainWater

Water in Maryland

All systems in state

All States

Water quality by state

Contaminants

PFAS & other pollutants

Guides

Understanding water quality

Related Data for Maryland

Environmental Data → Natural Hazards → Air Quality → Healthcare Access → Climate Data →

Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

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

Browse all → | Rankings →

Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial