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Tap water quality report

Swt Main

EPA monitoring tested this supplier for 110 contaminants and detected 29. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

110
contaminants tested
29
detected
14,500
people served
94
health-based violations
Pennsylvania rankingsLead in PennsylvaniaPFAS in Pennsylvania
Water source
SWP
Ownership
Local government
Counties served
Lehigh

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

94
health-based violations
535
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2016-09-01 → 2016-09-30
TT Health-based Resolved 2016-09-01 → 2016-09-30
TT Health-based Resolved 2016-09-01 → 2016-09-30
TT Health-based Resolved 2016-09-01 → 2016-09-30
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfpea 0.0101 µg/L 16/22 2024
Pfhxa 0.0054 µg/L 8/22 2024
PFOA 0.0040 µg/L 1/22 2024

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
6600 µg/L 66%
of the EPA limit 10000 µg/L
 190/198 SYR4 2012–2019
Bromodichloromethane
19 µg/L
No EPA limit set
 139/139 SYR4 2012–2019
Dibromochloromethane
9.7 µg/L
No EPA limit set
 136/139 SYR4 2012–2019
TTHM
73.3 µg/L 92%
of the EPA limit 80 µg/L
 136/142 SYR4 2012–2019
Chloroform
47 µg/L
No EPA limit set
 135/139 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
36 µg/L 60%
of the EPA limit 60 µg/L
 114/142 SYR4 2012–2019
Copper
858 µg/L 66%
of the EPA limit 1300 µg/L
 100/101 SYR4 2013–2019
Bromoform
3.2 µg/L
No EPA limit set
 93/139 SYR4 2012–2019
Lead
47 µg/L 313%
of the EPA limit, in the worst sample — 15 µg/L
 61/101 SYR4 2013–2019
Fluoride
530 µg/L 13%
of the EPA limit 4000 µg/L
 39/59 SYR4 2012–2019
Barium
67 µg/L 3.4%
of the EPA limit 2000 µg/L
 21/21 SYR4 2012–2018
Dichloroacetic Acid
8.09 µg/L
No EPA limit set
 18/20 SYR4 2018–2019
Trichloroacetic Acid
7.15 µg/L
No EPA limit set
 18/20 SYR4 2018–2019
Lead
0.0060 mg/L 40%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
Chromium
2 µg/L 2%
of the EPA limit 100 µg/L
 12/21 SYR4 2012–2018
Dibromoacetic Acid
1.97 µg/L
No EPA limit set
 10/20 SYR4 2018–2019
1,1,1-Trichloroethane
1.1 µg/L 0.6%
of the EPA limit 200 µg/L
 5/43 SYR4 2012–2019
Arsenic
0.6000 µg/L 6%
of the EPA limit 10 µg/L
 3/21 SYR4 2012–2018
Nitrite
3 µg/L 0.3%
of the EPA limit 1000 µg/L
 2/99 SYR4 2012–2019
Benzene
0.9000 µg/L 18%
of the EPA limit 5 µg/L
 1/43 SYR4 2012–2019
Cyanide
1 µg/L 0.5%
of the EPA limit 200 µg/L
 1/21 SYR4 2012–2018
Combined Uranium
1.0281 µg/L 3.4%
of the EPA limit 30 µg/L
 1/9 SYR4 2012–2018
Di(2-ethylhexyl) Phthalate
1.1 µg/L 18%
of the EPA limit 6 µg/L
 1/41 SYR4 2012–2019
Mercury
0.1000 µg/L 5%
of the EPA limit 2 µg/L
 1/21 SYR4 2012–2018
Selenium
1.2 µg/L 2.4%
of the EPA limit 50 µg/L
 1/21 SYR4 2012–2018
Thallium, Total
0.0300 µg/L 1.5%
of the EPA limit 2 µg/L
 1/21 SYR4 2012–2018
81 contaminants tested, none detected
1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Herb Bender
Phone
610-398-0407

Frequently asked questions about Swt Main

Is Swt Main tap water safe to drink?

EPA monitoring detected 29 contaminants in Swt Main's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Swt Main's water?

EPA monitoring detected Nitrate, Bromodichloromethane, Dibromochloromethane, TTHM, Chloroform, and others. The full list with the level and data source for each is above.

How many people does Swt Main serve?

Swt Main reports serving 14,500 people in Pennsylvania, per its EPA record.

Has Swt Main had any water quality violations?

The EPA has 535 violations on file for Swt Main, of which 94 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.