Lehigh County, PA · PWSID PA3390065
SWT Main System lead service lines
1 lead or galvanized lines to replace
SWT Main System reported 0 lead and 1 galvanized-requiring-replacement service lines out of 6,109 in its inventory. That's about 1 in 6,109 lines. Another 3,131 (51%) are still listed as unknown material.
Ranks #348 of 399 Pennsylvania systems with confirmed lead lines, and #6,748 nationally.
<0.1% of SWT Main System's service lines are lead or galvanized requiring replacement. That's lower than the Pennsylvania average (2.9%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) <0.1%
- Unknown 51%
- Non-lead 49%
Total service lines reported: 6,109. Reported all required service line types. Population served: 14,500; 6,284 connections.
Lead test results
SWT Main System's most recent 90th-percentile lead result (Jun 2025–Sep 2025) was 6 ppb, below both the 15 ppb action level and the 10 ppb level that takes effect in 2027. This means 90% of homes sampled were at or below that level; individual homes, especially those with lead lines, can be higher.
Lead and Copper Rule 90th-percentile results reported to EPA, in parts per billion. Dashed lines: 15 ppb action level and the 10 ppb level from November 1, 2027.
Progress since 2025 Q1
Reported lead and galvanized-requiring-replacement lines went from 0 in 2025 Q1 to 1 in 2026 Q3: up 1. Lines of unknown material went from 4,781 to 3,131, down 1,650 (35%).
Quarterly counts reported to EPA. A drop usually means lines were replaced or confirmed non-lead; a rise usually means more lines were identified. Replacement progress rankings.
Lead rule violations
EPA's data lists 1 Lead and Copper Rule violation since 2015 for SWT Main System. Health-based violations are treatment failures, such as corrosion control or public education; the rest are missed monitoring or reporting.
| Began | Violation | Status |
|---|---|---|
| Oct 2025 | Missed follow-up or routine lead and copper tap sampling | Returned to compliance |
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
SWT Main System's main water source is purchased surface water. It buys treated water from Lca Allentown Division, SWT Allentown Cons System. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while SWT Main System is responsible for its own service line inventory and replacement program. It sells water to 2 other water systems: Salisbury TWP Water System, Lca Wlsa Central Division.
Source: EPA SDWIS water system and facility records.
Check your own address
These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.
No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.
Protect your drinking water now
If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.
How to pick a lead-certified filter · How to test your water for lead
Getting the line replaced
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask SWT Main System whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.
County pages: Lead pipes in Lehigh County
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| Lca Allentown Division | 10,391 | 20,894 |
| Lca Wlsa Central Division | 0 | 6,977 |
| Emmaus Borough Public Water | 550 | 1,673 |
| Catasauqua Mun Water Works | 29 | 2,215 |
| Slatington Borough Water Sys | 88 | 626 |
| Macungie Borough Authority | 9 | 230 |
| Coopersburg Mun Water Auth | 12 | 766 |
| Lca Washington Township Div | 2 | 303 |
Check another water system
Questions
Does SWT Main System have lead pipes?
Yes. SWT Main System reported 0 lead service lines and 1 galvanized lines that must be replaced, out of 6,109 total. 3,131 more are of unknown material.
How do I check if my home's service line is lead?
Look up your address on SWT Main System's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.
When will SWT Main System replace lead service lines?
Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.
Has SWT Main System had lead violations?
EPA's data shows 1 Lead and Copper Rule violation since 2015 for SWT Main System.
Which water filters remove lead?
Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.
Embed or cite this data
Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.
Citation: Lead Pipe Map, "SWT Main System lead service lines," https://leadpipemap.com/pa/swt-main-system/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.