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Public water system record

Mawc Yough Plant

Serves an area of Fayette County, PA · 133,000 people served

Federal records show 2 health-based violations and 10 monitoring/reporting issues for Mawc Yough Plant in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.

  • PA5260036
  • GREENSBURG
  • PA
  • 133,000 served

System profile

Source water Surface water
ZIP 15601
EPA system ID PA5260036

Verify this system on EPA ECHO →

Health-based violations, last 10 years
2
Resolved
2
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
10

Key facts

  • Mawc Yough Plant draws water from 1 surface water intake.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit), 2022.
  • Most recent formal enforcement: consent decree or court judgment by Pennsylvania, April 2005.
  • Record on file since 1983, with 3 health-based violations before October 19, 2016.
  • Lead pipe inventory: 135 lead and 889 unknown out of 53,390 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Oct 1, 2022 Resolved No
Surface Water Treatment Rule
Treatment technique failure
 120 Aug 1, 2022 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Surface Water Treatment Rule
Monitoring and reporting
 Nov 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
CARBON, TOTAL
Monitoring and reporting
 Jul 1, 2025 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Jul 1, 2024 Resolved
Consumer Confidence Rule
OTHER
 Oct 1, 2022 Resolved
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
 Aug 1, 2021 Resolved
Nickel
Monitoring and reporting
 Jan 1, 2021 Resolved
CARBON, TOTAL
Monitoring and reporting
 Jan 1, 2018 Resolved
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
 Nov 1, 2017 Resolved
Surface Water Treatment Rule
Monitoring and reporting
 Nov 1, 2017 Resolved
Chlorine
Monitoring and reporting
 Oct 1, 2017 Resolved

Full record since 1983

EPA's records for Mawc Yough Plant go back to 1983. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 42 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 0 3
1990s 0 5
2000s 3 27
2010 to October 18, 2016 0 7
October 19, 2016 to 2019 0 4
2020s 2 6

Most recent health-based violation before October 19, 2016: CARBON, TOTAL, began July 2003, Resolved.

Show all 3 health-based violations before October 19, 2016
Contaminant Start date Status
CARBON, TOTAL
Treatment technique failure
 Jul 1, 2003 Resolved
CARBON, TOTAL
Treatment technique failure
 Apr 1, 2003 Resolved
CARBON, TOTAL
Treatment technique failure
 Jan 1, 2003 Resolved

Enforcement actions

Pennsylvania regulators took 7 formal enforcement actions against Mawc Yough Plant between 2003 and 2005, filed as 8 records in EPA's data. The most recent was a consent decree or court judgment in April 2005.

Date By Action Violations covered
Apr 22, 2005 Pennsylvania Consent decree or court judgment 16 violations: Methoxychlor, Endothall, Di(2-ethylhexyl) adipate, Simazine, Picloram
Apr 14, 2004 Pennsylvania Consent decree or court judgment 1 violation: CARBON, TOTAL
Mar 30, 2004 Pennsylvania Consent decree or court judgment 1 violation: Consumer Confidence Rule
Mar 23, 2004 Pennsylvania Consent decree or court judgment 4 violations: Gross Beta Particle Activity, Tritium, 38-STRONTIUM-90, Total Coliform
Feb 3, 2004 Pennsylvania Consent decree or court judgment 6 violations (3 health-based): CARBON, TOTAL
Jan 7, 2004 Pennsylvania Consent decree or court judgment 5 violations: CARBON, TOTAL, Consumer Confidence Rule
Dec 5, 2003 Pennsylvania Consent decree or court judgment 2 violations: CARBON, TOTAL

What the violations mean

Haloacetic Acids (HAA5)

1 incident

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Surface Water Treatment Rule

1 incident

The system did not complete a treatment step or action that the Surface Water Treatment Rule requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Mawc Yough Plant draws water from 1 surface water intake. It also buys water from PA Amer Water Co-Pittsburgh. 5 other community water systems and 2 smaller public systems such as schools, businesses or campgrounds buy water from Mawc Yough Plant.

Buys water from

Community systems that buy water from it

Annual water quality report

Mawc Yough Plant must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Pennsylvania.

Certified drinking water labs by state EPA guidance for private wells