Water Quality Report · Updated October 07, 2026
MAWC SWEENEY PLANT
MAWC SWEENEY PLANT delivers tap water graded C (73/100) by TapWaterSafety.org. The utility serves approximately 143,000 residents in GREENSBURG, Pennsylvania using surface water. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. For questions, the utility can be reached at 724-755-5800.
Is GREENSBURG tap water safe to drink?
MAWC SWEENEY PLANT delivers tap water that earns a grade of C (73/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 143,000 residents in GREENSBURG, drawing from surface water.
Public testing data identifies 10 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Trichloroacetic acid, Bromodichloromethane, Chloroform, Dichloroacetic acid, Dibromochloromethane, Nitrate, Chromium (hexavalent). For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
EPA compliance record
Official U.S. EPA records for MAWC SWEENEY PLANT (system ID PA5650032) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Surface Water Treatment Rule | Missed testing or reporting | 02/01/2025 | Resolved |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Missed testing or reporting | 06/01/2023 | Resolved |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Quick actions for GREENSBURG residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for MAWC SWEENEY PLANT.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 41.8 ppb, 696x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 41.7 ppb, 278x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 24.2 ppb, 242x above the EWG health guideline of 0.1 ppb.
Contact MAWC SWEENEY PLANT
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for GREENSBURG
Filters matched to the specific contaminants in this water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 73/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
41.8 ppb | 0.06 | — | — | — | — | — | 696× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
41.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 278× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
24.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 242× over |
| Trichloroacetic acid Disinfection byproduct |
13.8 ppb | 0.1 | — | — | — | — | — | 138× over |
| Bromodichloromethane Disinfection byproduct |
7.24 ppb | 0.06 | — | — | — | — | — | 121× over |
| Chloroform Disinfection byproduct |
33.7 ppb | 0.4 | — | — | — | — | — | 84× over |
| Dichloroacetic acid Disinfection byproduct |
8.91 ppb | 0.2 | — | — | — | — | — | 45× over |
| Dibromochloromethane Disinfection byproduct |
0.72 ppb | 0.1 | — | — | — | — | — | 7.2× over |
| Nitrate Inorganic |
0.407 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 2.9× over |
| Chromium (hexavalent) Heavy metal |
0.0364 ppb | 0.02 | — | — | — | — | — | 1.8× over |
| Chlorate Disinfection byproduct |
14.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
32.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
1.59 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
2.62 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Strontium Radiological |
0.0998 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.123 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
MAWC SWEENEY PLANT service area
This water system serves 1 community in Westmoreland County, Pennsylvania. Click any city for its dedicated tap water quality page.
Find the right filter for GREENSBURG water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.