Pontotoc County, OK · PWSID OK2006201
Ada lead service lines
103 lead or galvanized lines to replace
Ada reported 1 lead and 102 galvanized-requiring-replacement service lines out of 11,575 in its inventory. That's about 1 in 112 lines. Another 10,491 (91%) are still listed as unknown material.
Ranks #28 of 155 Oklahoma systems with confirmed lead lines, and #1,827 nationally.
0.9% of Ada's service lines are lead or galvanized requiring replacement. That's about the same as the Oklahoma average (0.9%) and lower than the national average (3.1%).
- Lead <0.1%
- Galvanized (replace) 0.9%
- Unknown 91%
- Non-lead 8.5%
Total service lines reported: 11,575. Reported all required service line types. Population served: 22,600; 11,575 connections.
Lead test results
Ada's most recent 90th-percentile lead result (Jan 2023–Dec 2025) was 1.7 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 103 in 2025 Q1 to 103 in 2026 Q3: no change. Lines of unknown material went from 10,491 to 10,491, 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 no Lead and Copper Rule violations for Ada since 2015. That covers testing, reporting, corrosion control and public notice requirements; it isn't a guarantee about any individual home.
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
Ada's main water source is groundwater (wells). It sells water to 4 other water systems: Pontotoc Co RWD # 1 (Homer), Pontotoc Co RWD # 7, Pontotoc Co RWD # 9, Pontotoc Co RWD # 6 (Fittstown).
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 Ada 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 Pontotoc County
Cities served
ZIP codes served
ZIP codes whose center falls inside Ada's mapped service area (EPA service area boundaries). Neighboring utilities may serve parts of the same ZIP.
74820
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| Pontotoc Co RWD # 7 | 0 | 0 |
| Pontotoc Co RWD # 8 | 0 | 0 |
| Pontotoc Co RWD # 9 | 0 | 514 |
| Pontotoc Co RWD # 6 (Fittstown) | 0 | 153 |
| Roff | 5 | 0 |
| Stonewall Pwa | 23 | 9 |
| Pontotoc Co RWD # 1 (Homer) | 0 | 233 |
| Francis | 1 | 104 |
Check another water system
Questions
Does Ada have lead pipes?
Yes. Ada reported 1 lead service lines and 102 galvanized lines that must be replaced, out of 11,575 total. 10,491 more are of unknown material.
How do I check if my home's service line is lead?
Look up your address on Ada'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 Ada 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 Ada had lead violations?
EPA's data shows no Lead and Copper Rule violations since 2015 for Ada.
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, "Ada lead service lines," https://leadpipemap.com/ok/ada/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.