Tap Water Quality Report
Tap water quality in NORRISTOWN, Pennsylvania
Tap water in NORRISTOWN, Pennsylvania receives a grade of F (59/100) from TapWaterSafety.org. It's served by PA AMERICAN NORRISTOWN. The most significant water quality concerns are: PFAS contamination; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Bromodichloromethane significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in NORRISTOWN's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving NORRISTOWN.
PFAS contamination
Severe concernPerfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 20.2 ppb, 336x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 41.4 ppb, 276x above the EWG health guideline of 0.15 ppb.
Bromodichloromethane significantly above health guideline
Moderate concernBromodichloromethane detected at 12.0 ppb, 200x above the EWG health guideline of 0.06 ppb.
Recommended filters for NORRISTOWN
Filters matched to the specific contaminants in NORRISTOWN's water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in NORRISTOWN's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. 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 |
20.2 ppb | 0.06 | — | — | — | — | — | 336× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
41.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 276× over |
| Bromodichloromethane Disinfection byproduct |
12.0 ppb | 0.06 | — | — | — | — | — | 200× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
18.6 ppb | 0.1 | 60.0 | 60 | — | — | — | 186× over |
| Trichloroacetic acid Disinfection byproduct |
9.96 ppb | 0.1 | — | — | — | — | — | 100× over |
| Chloroform Disinfection byproduct |
23.4 ppb | 0.4 | — | — | — | — | — | 59× over |
| Dibromochloromethane Disinfection byproduct |
5.28 ppb | 0.1 | — | — | — | — | — | 53× over |
| Chromium (hexavalent) Heavy metal |
0.929 ppb | 0.02 | — | — | — | — | — | 46× over |
| Dichloroacetic acid Disinfection byproduct |
7.7 ppb | 0.2 | — | — | — | — | — | 39× over |
| Dibromoacetic acid Disinfection byproduct |
0.942 ppb | 0.03 | — | — | — | — | — | 31× over |
| Nitrate Inorganic |
2.73 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 19× over |
| Perfluorooctanoic acid (PFOA) PFAS |
1.35 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 15× over |
| Bromoform Disinfection byproduct |
0.646 ppb | 0.5 | — | — | — | — | — | 1.3× over |
| Bromochloromethane Other |
0.065 ppb | 0.06 | — | — | — | — | — | 1.1× over |
| Chlorate Disinfection byproduct |
119.8 ppb | 210.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.163 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Antimony Heavy metal |
0.3 ppb | 1.0 | 6.0 | 10 | 20 | 1 | — | Below guideline |
| Molybdenum Other |
1.68 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.43 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
2.33 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
2.3 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
2.25 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.2 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.196 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Lithium Other |
3.8 ppb | — | — | — | — | — | — | 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, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from PA AMERICAN NORRISTOWN.