initiated to recheck and repair remaining, as well as newly developed, leaks in the
water network.
5.2 Leakage from the Sanitary Drainage System
1. Testing and flow calculations (using the Manning equation) for the sanitary
drainage sewers were performed when the pipes were flowing full. Therefore,
the weighted average percentage of leakage of 7% based on “flowing full
Table 6.8 Unaccounted for water standard for selected US states [2]
State
Agency
Standard
Arizona
Department of Water Resources
10% (large) 15%
(small)
California
Urban Water Conservation Council
10%
Florida
Southwest Florida Water Management District
12%or less
Florida
St. Johns River Water Management District
10%
Georgia
Environmental Protection Division
Less than 10%
Indiana
Department of Environ mental Management
10–20%
Kansas
Kansas Water Office
15%
Kentucky
Department of Energy, Water and Sewer Branch 15%
Louisiana
Department of Environmental Quality
15%
Massachusetts
Department of Environmental Protection
15%
Minnesota
Department of Natural Resources
10%
Missouri
Department of Natural Resources
10%
North Carolina
Division of Water Resources
15%
Ohio
Public Utility Commission and Environmental
Protection Agency
15%
Oregon
Water Resources Division
10–15%
Pennsylvania
Public Utility Commission
20%
Pennsylvania
Bureau of Water and Wastewater Management 10–15%
Rhode Island
Water Resources Board
10–15%
South Carolina
Public Service Commission
7.5%
South Carolina
Department of Health and Environmental
Control
10%
Texas
Water Development Board
10–15%
Texas
Natural Resources Conservation Commission
20%
Washington
Department of Health
20% (10%
proposed)
West Virginia
Public Service Commission
15%
Wisconsin
Public Service Commission
15% (large) 25%
(small)
Delaware River Basin
Commission
Delaware River Basin Commission
15%
6 Water Losses from Utilities
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