Delaware County, OK · PWSID OK3002157
Delaware Co Rwsg&swm District 11 lead service lines
331 lines still unidentified
Delaware Co Rwsg&swm District 11 reported no confirmed lead service lines, but 331 of 373 lines (89%) are still listed as "lead status unknown." Until a line is identified, treat it as possibly lead.
0% of Delaware Co Rwsg&swm District 11's service lines are lead or galvanized requiring replacement. That's lower than the Oklahoma average (0.9%) and lower than the national average (3.1%).
- Lead 0%
- Galvanized (replace) 0%
- Unknown 89%
- Non-lead 11%
Total service lines reported: 373. Reported all required service line types. Population served: 750; 373 connections.
Lead test results
Delaware Co Rwsg&swm District 11's most recent 90th-percentile lead result (Jan 2026–Jun 2026) 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 0 in 2025 Q1 to 0 in 2026 Q3: no change. Lines of unknown material went from 0 to 331, up 331.
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, 1 still open for Delaware Co Rwsg&swm District 11. 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 | Open |
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
Delaware Co Rwsg&swm District 11's main water source is purchased surface water. It buys treated water from South Delaware Co Regional Water Auth.. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while Delaware Co Rwsg&swm District 11 is responsible for its own service line inventory and replacement program. It sells water to 1 other water system: Colcord Pwa.
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 Delaware Co Rwsg&swm District 11 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 Delaware County
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| Grove Municipal Services Auth. | 101 | 2 |
| Jay | 0 | 1,417 |
| Ketchum Pwa Delaware Co System | 0 | 820 |
| South Delaware Co Regional Water Auth. | 0 | 447 |
| West Siloam Springs | 0 | 367 |
| Colcord Pwa | 23 | 0 |
| Kansas Public Works Authority | 0 | 350 |
| Delaware Co RWD # 7 | 0 | 298 |
Check another water system
Questions
Does Delaware Co Rwsg&swm District 11 have lead pipes?
It hasn't confirmed any, but 331 of its 373 service lines are still of unknown material, so lead has not been ruled out.
How do I check if my home's service line is lead?
Look up your address on Delaware Co Rwsg&swm District 11'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 Delaware Co Rwsg&swm District 11 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 Delaware Co Rwsg&swm District 11 had lead violations?
EPA's data shows 1 Lead and Copper Rule violation since 2015, 1 still open for Delaware Co Rwsg&swm District 11.
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, "Delaware Co Rwsg&swm District 11 lead service lines," https://leadpipemap.com/ok/delaware-co-rwsg-and-swm-district-11/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.