Oklahoma Water Quality Ratings

TapWaterSafety has rated 10 public water systems in Oklahoma, serving a combined 2,617,381 residents. The statewide average grade is D.

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
State average grade
D
64/100
Total utilities rated 10
Population served 2,617,381
Most recent test 2024
🇪🇺 Would fail EU standards 3 of 10

Top water quality concerns in Oklahoma

  • Haloacetic acids (HAA9) significantly above health guideline
  • Total trihalomethanes (TTHMs) significantly above health guideline
  • Chromium (hexavalent) significantly above health guideline
  • Arsenic significantly above health guideline
  • Haloacetic acids (HAA5) significantly above health guideline

Cities in Oklahoma

Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.

BROKEN ARROW
F 116,330
EDMOND
F 79,408
LAWTON
D 92,757
MIDWEST CITY
D 55,935
MOORE
F 55,083
NORMAN
F 104,868
OKLAHOMA CITY
D 644,000
Oklahoma City
C 655,000
TULSA
D 413,000
Tulsa
C 401,000

Grade distribution

A
0 (0%)
B
1 (10%)
C
5 (50%)
D
3 (30%)
F
1 (10%)

All rated utilities in Oklahoma

Sorted by score, highest first. Click any utility to see the full grade card.

Rank Utility City Population Score Grade
#1 Tulsa Municipal Water System Tulsa 401,000 76 B
#2 Oklahoma City Department of Public Works Oklahoma City 655,000 73 C
#3 LAWTON LAWTON 92,757 67 C
#4 TULSA TULSA 413,000 67 C
#5 MIDWEST CITY MIDWEST CITY 55,935 65 C
#6 OKLAHOMA CITY OKLAHOMA CITY 644,000 65 C
#7 NORMAN UTILITIES AUTHORITY NORMAN 104,868 59 D
#8 BROKEN ARROW MUNICIPAL AUTHORITY BROKEN ARROW 116,330 59 D
#9 MOORE PUBLIC WORKS AUTHORITY MOORE 55,083 55 D
#10 EDMOND PWA EDMOND 79,408 51 F