Grade B — Good Water Systems
Score range: 65-79/100
Water systems with good safety records and few minor violations.
Grade B Water Systems (54)
San Antonio Water System
San Antonio, Texas
Las Vegas Valley Water District
Las Vegas, Nevada
Citizens Water - Indianapolis
Indianapolis, Indiana
Jea Major Grid
Jacksonville, Florida
Metro Water Services
Nashville, Tennessee
Tucson City Of
Tucson, Arizona
Boston Water and Sewer Commission (mwra)
Boston, Massachusetts
Metropolitan Utilities District
Omaha, Nebraska
Raleigh, City Of
Raleigh, North Carolina
Central Alabama Water System
Birmingham, Alabama
Aurora City Of
Aurora, Colorado
Mcwa
Rochester, New York
Colorado Springs Utilities
Colorado Springs, Colorado
North Fulton County
Alpharetta, Georgia
Regional Water Authority
New Haven, Connecticut
Tulsa
Tulsa, Oklahoma
Loudoun Water - Central System
Ashburn, Virginia
St Louis City Pws
St Louis, Missouri
Howard County D.p.w. Distribution
Columbia, Maryland
Buffalo Water Authority
Buffalo, New York
Madison Water Utility
Madison, Wisconsin
Knoxville Utilities Board - Kub
Knoxville, Tennessee
City of Garland
Garland, Texas
Emerald Coast Utilities Authority (ecua)
Pensacola, Florida
Ann Arbor
Ann Arbor, Michigan
Tualatin Valley Water District
Beaverton, Oregon
Rochester City
Rochester, New York
Springfield Pws
Springfield, Missouri
Wvawc-Kanawha Valley Dist
Charleston, West Virginia
Westminster City Of
Westminster, Colorado
Salem Public Works
Salem, Oregon
Northern Kentucky Water District
Ft. Thomas, Kentucky
Lansing Board of Water & Light
Lansing, Michigan
Naperville
Naperville, Illinois
Kansas City Board of Public Utilities
Kansas City, Kansas
Olathe, City Of
Olathe, Kansas
Cedar Rapids Water Department
Cedar Rapids, Iowa
City of Columbia Utilities
Columbia, Missouri
Granger-Hunter Improvement District
Salt Lake City, Utah
Aquarion-Stamford
Shelton, Connecticut
West Jordan City Water System
West Jordan, Utah
Broken Arrow Municipal Authority
Broken Arrow, Oklahoma
Provo City
Provo, Utah
Green Bay Waterworks
Green Bay, Wisconsin
Rio Rancho Water & Ww Services
Rio Rancho, New Mexico
Medford Water Commission
Medford, Oregon
Harford County D.p.w.
Abingdon, Maryland
Lawton
Lawton, Oklahoma
Warren County Water District
Bowling Green, Kentucky
Brooklyn Park
Brooklyn Park, Minnesota
Carson City Public Works
Carson City, Nevada
City of Southaven
Southaven, Mississippi
City of Olive Branch
Olive Branch, Mississippi
City of Hattiesburg
Hattiesburg, Mississippi
Frequently Asked Questions
A Grade B rating means the water system scored between 65-79 out of 100 on our Water Safety Score. Water systems with good safety records and few minor violations. The score factors in health-based violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring compliance (10%).
54 water systems are currently rated Grade B, serving a combined population of 18,501,281 people. 4 of these systems have at least one health-based violation on record.
Use the search tool on our homepage to look up your water system by zip code. Every system in the US is graded A through F based on EPA violation data from the Safe Drinking Water Information System (SDWIS).