St. Landry Parish County, LA · PWSID LA1097001
Town of Grand Coteau Water System lead service lines
No inventory counts on file
Town of Grand Coteau Water System serves about 1,650 people in St. Landry Parish County, LA, but EPA's EPA SDWIS service line inventory, 2026 Q3 data has no service line counts for it. That doesn't mean the system has no lead. Ask the utility for its inventory, or check your own pipe with the steps below.
Lead test results
Town of Grand Coteau Water System's most recent 90th-percentile lead result (2026) was 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.
Lead rule violations
EPA's data lists 5 Lead and Copper Rule violations since 2015 for Town of Grand Coteau Water System. Health-based violations are treatment failures, such as corrosion control or public education; the rest are missed monitoring or reporting.
| Began | Violation | Status |
|---|---|---|
| Jan 2025 | Missed follow-up or routine lead and copper tap sampling | Returned to compliance |
| Sep 2024 | Lead consumer notice not delivered or reported | Returned to compliance |
| Apr 2021 | Lead consumer notice not delivered or reported | Returned to compliance |
| Oct 2018 | Missed follow-up or routine lead and copper tap sampling | Returned to compliance |
| Jul 2015 | 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
Town of Grand Coteau Water System's main water source is groundwater (wells). It buys treated water from Town of Sunset Water System. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while Town of Grand Coteau Water System is responsible for its own service line inventory and replacement program. It sells water to 1 other water system: Town of Sunset Water System.
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 Town of Grand Coteau Water 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 St. Landry Parish
Other water systems nearby
Check another water system
Questions
Does Town of Grand Coteau Water System have lead pipes?
Town of Grand Coteau Water System has not reported service line counts in EPA's data. Ask the utility for its lead service line inventory, which it was required to prepare by October 16, 2024.
How do I check if my home's service line is lead?
Look up your address on Town of Grand Coteau Water 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 Town of Grand Coteau Water 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 Town of Grand Coteau Water System had lead violations?
EPA's data shows 5 Lead and Copper Rule violations since 2015 for Town of Grand Coteau Water 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, "Town of Grand Coteau Water System lead service lines," https://leadpipemap.com/la/town-of-grand-coteau-water-system/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.