CheckPFAS

ZIP Code 21771

High Risk
High Risk PFAS Risk Level

PFAS above EPA limits detected

2 compounds exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.

7
PFAS Detected
2
Above EPA Limits
1
Water System
318%
Highest % of MCL

Compounds Exceeding EPA Limits

PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 318% of limit
Detected: 12.70 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 150% of limit
Detected: 6.00 ppt
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TOWN OF MOUNT AIRY

MD0060007 High Risk
Water Type
Groundwater
PFAS Detected
7
Above MCL
2
State
Maryland
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOA
Perfluorooctanoic acid
12.70ppt
318% of limit
4 ppt⚠ Exceeds MCL
PFOS
Perfluorooctane sulfonic acid
6.00ppt
150% of limit
4 ppt⚠ Exceeds MCL
PFPeA
Perfluoropentanoic acid
22.70pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
18.40pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
11.60pptNo federal limit—Unregulated
PFBS
Perfluorobutane sulfonic acid
6.60pptNo federal limit—Unregulated
PFHpA
Perfluoroheptanoic acid
5.90pptNo federal limit—Unregulated

Data source: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5) — January 2026 release.

UCMR 5 tested ~10,000 public water systems serving more than 25 people between 2023-2025 for 29 PFAS compounds.

Detection values represent the highest single-sample result measured at entry points to the distribution system.

View raw EPA data →