Harris County, TX · PWSID TX1011911
Southwest Harris County MUD 1 lead service lines
1 lead or galvanized lines to replace
Southwest Harris County MUD 1 reported 0 lead and 1 galvanized-requiring-replacement service lines out of 534 in its inventory. That's about 1 in 534 lines. Another 0 (0%) are still listed as unknown material.
Ranks #515 of 534 Texas systems with confirmed lead lines, and #7,023 nationally.
0.2% of Southwest Harris County MUD 1's service lines are lead or galvanized requiring replacement. That's lower than the Texas average (1.2%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0.2%
- Unknown 0%
- Non-lead 100%
Total service lines reported: 534. Reported all required service line types. Population served: 1,581; 527 connections.
Lead test results
Southwest Harris County MUD 1's most recent 90th-percentile lead result (Jul 2025–Dec 2025) was 2.5 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 1 in 2025 Q1 to 1 in 2026 Q3: no change. Lines of unknown material went from 0 to 0, no change.
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 4 Lead and Copper Rule violations since 2015, 3 health-based for Southwest Harris County MUD 1. Health-based violations are treatment failures, such as corrosion control or public education; the rest are missed monitoring or reporting.
| Began | Violation | Status |
|---|---|---|
| Oct 2024 | Missed follow-up or routine lead and copper tap sampling | Returned to compliance |
| Apr 2022 | Corrosion control study or recommendation not done health-based | Returned to compliance |
| Mar 2022 | Corrosion control study or recommendation not done health-based | Returned to compliance |
| Dec 2021 | Public education requirement not met health-based | Returned to compliance |
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
Southwest Harris County MUD 1's main water source is purchased surface water. It buys treated water from Harris County WCID Fondren Road. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while Southwest Harris County MUD 1 is responsible for its own service line inventory and replacement program.
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 Southwest Harris County MUD 1 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 Harris County
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| City of Deer Park | 215 | 4,263 |
| City of South Houston | 1,554 | 2,865 |
| City of Humble | 298 | 1 |
| Harris County WCID 36 | 890 | 6 |
| City of Jacinto City | 589 | 0 |
| Harris County WCID 1 | 826 | 0 |
| Sunbelt FWSD Oakwilde Subdivision | 331 | 0 |
| City of Spring Valley Village | 193 | 656 |
Check another water system
Questions
Does Southwest Harris County MUD 1 have lead pipes?
Yes. Southwest Harris County MUD 1 reported 0 lead service lines and 1 galvanized lines that must be replaced, out of 534 total. 0 more are of unknown material.
How do I check if my home's service line is lead?
Look up your address on Southwest Harris County MUD 1'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 Southwest Harris County MUD 1 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 Southwest Harris County MUD 1 had lead violations?
EPA's data shows 4 Lead and Copper Rule violations since 2015, 3 health-based for Southwest Harris County MUD 1.
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, "Southwest Harris County MUD 1 lead service lines," https://leadpipemap.com/tx/southwest-harris-county-mud-1/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.