MOUNT VERNON WATER WORKS

Q: Is MOUNT VERNON WATER WORKS water safe to drink?

MOUNT VERNON WATER WORKS (PWS ID: IN5265006) has 623 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 4 PFAS compounds found. This system serves 6,426 people using Surface Water sources.

Q: What type of violations does MOUNT VERNON WATER WORKS have?

MOUNT VERNON WATER WORKS has 623 total violations: 188 health-based violations (MCL exceedances or treatment failures), 414 monitoring/reporting violations, and 31 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Q: Has PFAS been detected in MOUNT VERNON WATER WORKS water?

Yes. UCMR5 testing detected 4 PFAS compounds in MOUNT VERNON WATER WORKS's water supply: PFHxA, PFOA, PFPeA, HFPO-DA. PFAS are persistent "forever chemicals" that do not break down in the environment.

Q: What water source does MOUNT VERNON WATER WORKS use?

MOUNT VERNON WATER WORKS uses Surface Water 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 4, 2026

PWS ID: IN5265006 · MOUNT VERNON, Indiana 47620

MOUNT VERNON WATER WORKS serves 6,426 people in MOUNT VERNON, Indiana using Surface Water water sources. It has 623 recorded EPA violations, including 188 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (4 compounds found).

Water Quality Snapshot: MOUNT VERNON WATER WORKS

MOUNT VERNON WATER WORKS is a local-owned community water system that delivers drinking water to 6,426 residents in MOUNT VERNON, Indiana (Posey County) through 2,400 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 623 total violations for this system , of which 188 (30%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 414 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is TTHM, recorded in 84 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 4 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 0.0174 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Indiana, EPA tracks 3,967 public water systems serving 5,774,616 people, with 352,710 cumulative violations and 35,932 health-based violations on record. About 96% of systems in the state carry at least one violation, and state-wide the average per system is 88.9 violations. MOUNT VERNON WATER WORKS's 623 violations sit above the Indiana average. Statewide, 93 of 229 UCMR5-tested systems have reported PFAS detections (40.6%). 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

6,426

Total Violations

623

Health-Based Violations

188

Water Source

Surface Water

System Details

System Type: Community
Owner Type: Local
Connections: 2,400
County: Posey
School/Daycare: No
MCL Violations: 157
Monitoring Violations: 414
Treatment Tech Violations: 31

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
TTHM	MCL	84	2009
Total Haloacetic Acids (HAA5)	MCL	40	2008
Coliform (TCR)	MCL	33	2011
Surface Water Treatment Rule	TT	24	2005
Atrazine	MR	19	2016
Coliform (TCR)	MR	19	1999
Nitrate	MR	17	1994
Simazine	MR	15	2016
LASSO	MR	15	2016
Di(2-ethylhexyl) phthalate	MR	15	2016
Di(2-ethylhexyl) adipate	MR	15	2016
1,2-DIBROMO-3-CHLOROPROPANE	MR	15	1995
Consumer Confidence Rule	Other	9	2023
Chromium	MR	7	2005
Cadmium	MR	7	2005
Arsenic	MR	7	2005
Barium	MR	7	2005
Selenium	MR	7	2005
Mercury	MR	7	2005
Revised Total Coliform Rule	MON	6	2025
Fluoride	MR	6	2016
1,2-Dichloroethane	MR	5	1998
1,1,1-Trichloroethane	MR	5	1998
CHLOROBENZENE	MR	5	1998
Benzene	MR	5	1998
1,2,4-Trichlorobenzene	MR	5	1998
Ethylbenzene	MR	5	1998
cis-1,2-Dichloroethylene	MR	5	1998
Xylenes, Total	MR	5	1998
DICHLOROMETHANE	MR	5	1998

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 7 of 120 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
PFMBA	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	9/10/2024	0.0032 µg/L	0.003 µg/L	Detected
NMeFOSAA	9/10/2024	<0.006 µg/L	0.006 µg/L	Not Detected
NEtFOSAA	9/10/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFTrDA	9/10/2024	<0.007 µg/L	0.007 µg/L	Not Detected
PFTA	9/10/2024	<0.008 µg/L	0.008 µg/L	Not Detected
PFHpS	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeS	9/10/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFDoA	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
NFDHA	9/10/2024	<0.02 µg/L	0.02 µg/L	Not Detected
PFDA	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFNA	9/10/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFOA	9/10/2024	0.0040 µg/L	0.004 µg/L	Detected
PFPeA	9/10/2024	0.0037 µg/L	0.003 µg/L	Detected
lithium	9/10/2024	<9 µg/L	9 µg/L	Not Detected
PFMPA	9/10/2024	<0.004 µg/L	0.004 µg/L	Not Detected
8:2 FTS	9/10/2024	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
6:2 FTS	9/10/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFBA	9/10/2024	<0.005 µg/L	0.005 µg/L	Not Detected
HFPO-DA	9/10/2024	0.0053 µg/L	0.005 µg/L	Detected
ADONA	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
9Cl-PF3ONS	9/10/2024	<0.002 µg/L	0.002 µg/L	Not Detected
11Cl-PF3OUdS	9/10/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFEESA	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFOS	9/10/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFUnA	9/10/2024	<0.002 µg/L	0.002 µg/L	Not Detected
PFHxS	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFBS	9/10/2024	<0.003 µg/L	0.003 µg/L	Not Detected
HFPO-DA	6/4/2024	<0.005 µg/L	0.005 µg/L	Not Detected
NMeFOSAA	6/4/2024	<0.006 µg/L	0.006 µg/L	Not Detected
PFHxS	6/4/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFDoA	6/4/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFOS	6/4/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFHxA	6/4/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFUnA	6/4/2024	<0.002 µg/L	0.002 µg/L	Not Detected
11Cl-PF3OUdS	6/4/2024	<0.005 µg/L	0.005 µg/L	Not Detected
9Cl-PF3ONS	6/4/2024	<0.002 µg/L	0.002 µg/L	Not Detected
PFOA	6/4/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFBS	6/4/2024	<0.003 µg/L	0.003 µg/L	Not Detected
ADONA	6/4/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	6/4/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFBA	6/4/2024	<0.005 µg/L	0.005 µg/L	Not Detected
6:2 FTS	6/4/2024	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	6/4/2024	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	6/4/2024	<0.005 µg/L	0.005 µg/L	Not Detected
PFMPA	6/4/2024	<0.004 µg/L	0.004 µg/L	Not Detected
PFPeA	6/4/2024	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	6/4/2024	<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 MOUNT VERNON WATER WORKS.

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 IN5265006 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Indiana Drinking Water Authority

Indiana Department of Environmental Management — Drinking Water Branch is the primacy agency that licenses and inspects MOUNT VERNON WATER WORKS under EPA-delegated authority.

Open IN regulator portal

Source: Indiana Department of Environmental Management — Drinking Water Branch

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
2025	Revised Total Coliform Rule	MON	6	SDWIS / IN5265006 / 8000
2023	Consumer Confidence Rule	Other	9	SDWIS / IN5265006 / 7000
2016	Atrazine	MR	19	SDWIS / IN5265006 / 2050
2016	Simazine	MR	15	SDWIS / IN5265006 / 2037
2016	LASSO	MR	15	SDWIS / IN5265006 / 2051
2016	Di(2-ethylhexyl) phthalate	MR	15	SDWIS / IN5265006 / 2039
2016	Di(2-ethylhexyl) adipate	MR	15	SDWIS / IN5265006 / 2035
2016	Fluoride	MR	6	SDWIS / IN5265006 / 1025
2012	Interim Enhanced Surface Water Treatment Rule	TT	4	SDWIS / IN5265006 / 0300
2011	Coliform (TCR)	MCL	33	SDWIS / IN5265006 / 3100
2009	TTHM	MCL	84	SDWIS / IN5265006 / 2950
2008	Total Haloacetic Acids (HAA5)	MCL	40	SDWIS / IN5265006 / 2456
2006	TTHM	MR	5	SDWIS / IN5265006 / 2950
2006	CARBON, TOTAL	MR	4	SDWIS / IN5265006 / 2920
2006	Total Haloacetic Acids (HAA5)	MR	4	SDWIS / IN5265006 / 2456

How MOUNT VERNON WATER WORKS Compares

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

Metric	MOUNT VERNON WATER WORKS	Indiana avg	Federal benchmark
Total violations	623	88.9	SDWA compliance — any non-zero count is a recorded breach
Health-based violations	188	9.1	Indicates a contaminant exceeded a federal MCL
PFAS detection	4 compounds	40.6%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	6,426	1,456	Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 3,967 regulated public water systems in Indiana.

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 MOUNT VERNON WATER WORKS water safe to drink? ▼

MOUNT VERNON WATER WORKS (PWS ID: IN5265006) has 623 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 4 PFAS compounds found. This system serves 6,426 people using Surface Water sources.

How many people does MOUNT VERNON WATER WORKS serve? ▼

MOUNT VERNON WATER WORKS serves 6,426 people in MOUNT VERNON, Indiana. It is a Local-owned system using Surface Water water sources with 2,400 service connections.

What type of violations does MOUNT VERNON WATER WORKS have? ▼

MOUNT VERNON WATER WORKS has 623 total violations: 188 health-based violations (MCL exceedances or treatment failures), 414 monitoring/reporting violations, and 31 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in MOUNT VERNON WATER WORKS water? ▼

Yes. UCMR5 testing detected 4 PFAS compounds in MOUNT VERNON WATER WORKS's water supply: PFHxA, PFOA, PFPeA, HFPO-DA. PFAS are persistent "forever chemicals" that do not break down in the environment.

What water source does MOUNT VERNON WATER WORKS use? ▼

MOUNT VERNON WATER WORKS 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.

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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.

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