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Community Water System · PWS MD0100023

Town of Thurmont

Thurmont, Maryland 21788 - drinking water served from surface water sources to 6,200 people, tracked in EPA SDWIS and UCMR5.

6,200
People served
99
EPA violations
9
Health-based
4 PFAS
UCMR5 result

The verdict

EPA records 99 drinking-water violations at Town of Thurmont, 9% of them health-based - above the Maryland per-system average, and UCMR5 testing detected 4 PFAS compounds.

99
Total EPA violations on record
9%
Health-based (MCL / treatment failure)
6,200
People served by this system
4
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Town of Thurmont

Town of Thurmont is a local-owned community water system that delivers drinking water to 6,200 residents in Thurmont, Maryland (Frederick County) through 2,360 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 99 total violations for this system , of which 9 (9%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 82 monitoring and reporting violations are on file. The most recent violation on record dates to 2010.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 5 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 4 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 48 ppt (parts per trillion). 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. Statewide, 50 of 83 UCMR5-tested systems have reported PFAS detections (60.2%).

Town of Thurmont's 99 violations sit above the Maryland average.

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

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

Population Served
6,200
Total Violations
99
Health-Based Violations
9
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
2,360
County
Frederick
School/Daycare
No
MCL Violations
4
Monitoring Violations
82
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 5 2010
Nitrate MR 5 2010
Trichloroethylene MCL 4 1999
Mercury MR 3 1996
Chromium MR 3 1996
Nickel MR 3 1996
Antimony, Total MR 3 1996
Thallium, Total MR 3 1996
Cadmium MR 3 1996
Surface Water Treatment Rule TT 3 1996
Selenium MR 3 1996
Barium MR 3 1996
Beryllium, Total MR 3 1996
Fluoride MR 3 2008
Xylenes, Total MR 2 2002
o-Dichlorobenzene MR 2 2002
Vinyl chloride MR 2 2002
1,1-Dichloroethylene MR 2 2002
1,2-Dichloropropane MR 2 2002
Trichloroethylene MR 2 2002
1,1,2-Trichloroethane MR 2 2002
Tetrachloroethylene MR 2 2002
Benzene MR 2 2002
Toluene MR 2 2002
Ethylbenzene MR 2 2002
Carbon tetrachloride MR 2 2002
Lead and Copper Rule TT 2 2008
1,2,4-Trichlorobenzene MR 2 2002
1,2-Dichloroethane MR 2 2002
1,1,1-Trichloroethane MR 2 2002

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 31 of 232 samples detected PFAS.

Contaminant Date Result MRL Status
PFDA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFDoA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeS 7/14/2025 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/14/2025 <2.00 ppt 2.00 ppt Not Detected
PFOA 7/14/2025 13.00 ppt 4.00 ppt Detected
8:2 FTS 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
PFHxA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFMPA 7/14/2025 <4.00 ppt 4.00 ppt Not Detected
PFTA 7/14/2025 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 7/14/2025 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 7/14/2025 <6.00 ppt 6.00 ppt Not Detected
4:2 FTS 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 7/14/2025 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
ADONA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFBA 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
PFPeA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFBS 7/14/2025 3.30 ppt 3.00 ppt Detected
PFHpA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/14/2025 5.30 ppt 3.00 ppt Detected
PFNA 7/14/2025 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/14/2025 12.00 ppt 4.00 ppt Detected
NFDHA 7/14/2025 <20.00 ppt 20.00 ppt Not Detected
11Cl-PF3OUdS 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 7/14/2025 <2.00 ppt 2.00 ppt Not Detected
ADONA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
PFBA 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
NFDHA 7/14/2025 <20.00 ppt 20.00 ppt Not Detected
PFPeA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeS 7/14/2025 <4.00 ppt 4.00 ppt Not Detected
PFMBA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/14/2025 <2.00 ppt 2.00 ppt Not Detected
PFMPA 7/14/2025 <4.00 ppt 4.00 ppt Not Detected
PFTrDA 7/14/2025 <7.00 ppt 7.00 ppt Not Detected
PFHxA 7/14/2025 <3.00 ppt 3.00 ppt Not Detected
PFBS 7/14/2025 3.80 ppt 3.00 ppt Detected
PFTA 7/14/2025 <8.00 ppt 8.00 ppt Not Detected
NEtFOSAA 7/14/2025 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 7/14/2025 <6.00 ppt 6.00 ppt 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 Thurmont.

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 MD0100023 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
2010 Lead and Copper Rule MR 5 SDWIS / MD0100023 / 5000
2010 Nitrate MR 5 SDWIS / MD0100023 / 1040
2008 Fluoride MR 3 SDWIS / MD0100023 / 1025
2008 Lead and Copper Rule TT 2 SDWIS / MD0100023 / 5000
2007 Consumer Confidence Rule Other 1 SDWIS / MD0100023 / 7000
2002 Xylenes, Total MR 2 SDWIS / MD0100023 / 2955
2002 o-Dichlorobenzene MR 2 SDWIS / MD0100023 / 2968
2002 Vinyl chloride MR 2 SDWIS / MD0100023 / 2976
2002 1,1-Dichloroethylene MR 2 SDWIS / MD0100023 / 2977
2002 1,2-Dichloropropane MR 2 SDWIS / MD0100023 / 2983
2002 Trichloroethylene MR 2 SDWIS / MD0100023 / 2984
2002 1,1,2-Trichloroethane MR 2 SDWIS / MD0100023 / 2985
2002 Tetrachloroethylene MR 2 SDWIS / MD0100023 / 2987
2002 Benzene MR 2 SDWIS / MD0100023 / 2990
2002 Toluene MR 2 SDWIS / MD0100023 / 2991

How Town of Thurmont Compares

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

Metric Town of Thurmont Maryland avg Federal benchmark
Total violations 99 18.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 9 5.6 Indicates a contaminant exceeded a federal MCL
PFAS detection 4 compounds 60.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 6,200 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 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Town of Thurmont water safe to drink?
Town of Thurmont (PWS ID: MD0100023) has 99 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 4 PFAS compounds found. This system serves 6,200 people using Surface Water sources.
How many people does Town of Thurmont serve?
Town of Thurmont serves 6,200 people in Thurmont, Maryland. It is a Local-owned system using Surface Water water sources with 2,360 service connections.
What type of violations does Town of Thurmont have?
Town of Thurmont has 99 total violations: 9 health-based violations (MCL exceedances or treatment failures), 82 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Town of Thurmont water?
Yes. UCMR5 testing detected 4 PFAS compounds in Town of Thurmont's water supply: PFOA, PFBS, PFHxS, PFOS. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Town of Thurmont use?
Town of Thurmont uses Surface Water 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.
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.
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 system's figures are rendered directly from 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.