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963 Oklahoma water systems have inventoried 1,505,952 service lines for EPA. 4,829 (0.3%) are confirmed lead and 623,392 (41%) are still of unknown material. Below: every large or city-linked Oklahoma utility ranked by lead lines.
Oklahoma water systems reported 4,829 lead service lines and 9,423 galvanized lines requiring replacement as of Q2 2026 — 0.3% of the 1,505,952 lines inventoried and 0.2% of the national lead total, ranking #27 of 51. OKLAHOMA CITY reports the most in the state (173).
OKLAHOMA CITY (173), NORMAN UTILITIES AUTHORITY (13), LAWTON (1).
Find your utility in the table below, then check its published service line inventory (most utilities post an address-lookup map) or call the number on your water bill. Utilities must notify customers whose line is lead, galvanized-requiring-replacement or unknown. You can also test the pipe entering your home: lead is soft, dull gray, non-magnetic and turns shiny when scratched.
Under EPA's Lead and Copper Rule Improvements, systems must replace lead and galvanized-requiring-replacement lines within 10 years starting in 2027; systems with very high counts can receive longer deadlines. Ask your utility for its replacement plan and whether it covers the homeowner-owned portion.
Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking, flush the tap after water has sat for hours, never use hot tap water for drinking or infant formula, and confirm your actual level with a certified lab test.
Source: EPA SDWIS Service Line Inventory, Q2 2026 snapshot (updated 2026-08-18). Counts are service lines, not people.
837 of the 963 Oklahoma systems in EPA's Q2 2026 report have filed line counts. The 4,829 confirmed lead lines and 9,423 galvanized lines requiring replacement come from 48 systems — 5.7% of those reporting — so lead pipe in Oklahoma is concentrated in a small share of systems. 623,392 lines (41%) are still of unknown material, above the national share of 22%.
Treat "unknown" as the operative number. Under EPA's Lead and Copper Rule Revisions (LCRR), every community water system had to submit an initial service line inventory by October 16, 2024, and lines whose material could not be documented were reported as unknown. The Lead and Copper Rule Improvements (LCRI), finalized in October 2024, require systems to keep identifying those lines, to notify customers served by a lead, galvanized-requiring-replacement or unknown line, and to replace lead and galvanized-requiring-replacement lines — generally within 10 years of the rule's November 1, 2027 compliance date. The LCRI also lowers the lead action level from 15 to 10 ppb. For Oklahoma, that makes the 623,392 unknown lines (41%) the pool from which future confirmed-lead counts will be drawn.
Among the 2 Oklahoma utilities linked to a city report on this site, 1 reports at least one lead or galvanized-requiring-replacement line and 1 reports none but still has a quarter or more of its lines unverified. The largest — OKLAHOMA CITY (644,000 served) and TULSA (413,000 served) — report 173 lead + 6 GRR and 79% unknown respectively.
Your own answer is one lookup away: search your utility's service line inventory (usually an address map on its website), or read the water system name and lead results in your latest Consumer Confidence Report. Customers on a lead, galvanized-requiring-replacement or unknown line must be notified by the utility. Failing that, scratch the pipe at the water meter — lead is soft, dull gray, non-magnetic and turns shiny where scratched.
EPA's rule text and timelines are on its Lead and Copper Rule Improvements page. While your line is unverified, our best water filters for lead guide covers NSF/ANSI 53-certified options, and the lead in drinking water guide explains testing and health thresholds.
EPA SDWIS Service Line Inventory, Q2 2026 snapshot (updated 2026-08-18); regulatory dates from EPA's LCRR/LCRI pages.
Community systems serving 50,000+ people plus systems linked to a city report on this site (9 shown). State totals above include every reporting system.
| # | Water system | Status | Lead | GRR | Unknown | Total lines | City report |
|---|---|---|---|---|---|---|---|
| 1 | OKLAHOMA CITY OK1020902 · 644,000 served | Lead service lines present | 173 | 6 | 32,667 | 254,388 | Oklahoma City → |
| 2 | NORMAN UTILITIES AUTHORITY OK1020801 · 104,868 served | Lead service lines present | 13 | 960 | 20,887 | 42,749 | |
| 3 | LAWTON OK1011303 · 92,757 served | Lead service lines present | 1 | 655 | 23,958 | 32,613 | |
| 4 | TULSA OK1020418 · 413,000 served | Many lines still unverified | 0 | 0 | 128,216 | 162,343 | Tulsa → |
| 5 | MIDWEST CITY OK1020806 · 55,935 served | Many lines still unverified | 0 | 0 | 15,392 | 21,540 | |
| 6 | EDMOND PWA OK1020723 · 79,408 served | Many lines still unverified | 0 | 0 | 13,962 | 32,937 | |
| 7 | MOORE PUBLIC WORKS AUTHORITY OK2001412 · 55,083 served | Many lines still unverified | 0 | 0 | 11,761 | 24,702 | |
| 8 | STILLWATER UTILITIES AUTHORITY OK1021220 · 53,000 served | Lead service lines present | 0 | 294 | 556 | 17,348 | |
| 9 | BROKEN ARROW MUNICIPAL AUTHORITY OK1021508 · 116,330 served | No lead service lines reported | 0 | 0 | 0 | 41,154 |
A lead or unknown service line means lead can enter water after it leaves the treatment plant, so city-level test results understate what reaches your tap. Filter drinking and cooking water with an NSF/ANSI 53 lead-certified system, and see the lead in drinking water guide or Oklahoma city water reports.
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