Idaho Clean Watersheds Needs Survey 2008 The Clean Watersheds Needs Survey (CWNS) is a comprehensive assessment of needs1 to meet the water quality and water-related public health goals of the Clean Water Act (CWA). States and the U.S. Environmental Protection Agency (EPA) conduct the CWNS every four years under CWA Section 516 (b). Idaho documented needs totaling $1.5 billion in 2008. This is a 98 percent increase from the $741 million in needs documented in 2004. Documented Needs in Idaho Needs (2008 Dollars, Millions) Type of Need 2004 2008 Percent Change Wastewater treatment $336 $1,019 203% Pipe repair and new pipes $191 $349 83% Recycled water distribution <$0.5 <$0.5 0% Combined sewer overflow correction $0 $0 0% Total Wastewater Treatment Needs $527 $1,368 159% Conveyance infrastructure n/a $1 n/a Treatment systems n/a $2 n/a Green infrastmcture n/a $2 n/a General stormwater management $38 $4 -89% Total Stormwater Management Needsb $38 $9 -76% Agriculture (cropland) best management practices (BMPs) $81 $30 -63% Agriculture (animals) BMPs $33 $37 12% Silviculture (forestry) BMPs $9 $2 -78% Ground water protection: unknown source BMPs nr <$0.5 n/a Marinas BMPs <$0.5 <$0.5 35% Resource extraction BMPs $2 $1 -50% Brownfields remediation nr nr 0% Storage tank remediation nr nr 0% Sanitary landfills BMPs nr nr 0% HydromodiScalion (Water resource restoration and protection) $51 $18 -65% Other estuary management activities0 n/a nr n/a Total Nonpoint Source Control NeedsM $176 $88 -50% Total Decentralized Wastewater Treatment Needsb'd <$0.5 nra -100%. Total Needs $741 $1,465 98%. aNot reported; Actual needs may be higher, since documenting these needs is difficult; °In 2004, Other Estuary Management Needs were reported under Separate State Estimates (SSEs); dNot included in Official Needs in the Report to Congress. County Needs ($M) None reported < 5 5-25 >25 1 Documented needs in the CWNS include the unfunded capital costs of projects as of January 1, 2008 that address a water quality or a water quality-related public health problem existing as of January 1, 2008, or expected to occur within the next 20 years; and meet the seven CWNS documentation criteria. All needs are in January 2008 dollars. ------- Idaho Clean Watersheds Needs Survey 2008 Wastewater Treatment Facilities The enactment of the Clean Water Act (CWA) in 1972 resulted in dramatic improvements in the: Number of wastewater treatment plants. Percentage of the population served by wastewater treatment plants. Quality of effluent treatment from wastewater treatment facilities. In 2008, 72% of Idaho residents received centralized wastewater treatment services at the secondary, advanced, or no discharge treatment level, compared to 16% in 1972. Number of Centralized Treatment Facilities and Population Served Number of Facilities Population Served %Total %Total Population Population Treatment Level 1972 2008 Projected" 1972 1972 2008 2008 Projected3 Less than Secondary 20 0 0 178,000 22 0 0 0 Secondary 11 98 87 108,000 13 530,059 35 543,194 Advanced 2 13 27 24,000 3 496,573 33 1,296,946 No Discharge 0 55 56 0 0 58,754 4 89,303 Total 33 166 170 310,000 38 1,085,386 72 1,929,443 a Number of facilities and population served if all needs documented in the CWNS 2008 are met. Small Communities In Idaho, small community wastewater facilities serve 11% of the population and comprise 19% of total wastewater treatment and collection needs. EPA small community support information is available at: www. epa. gov/owm/mab/smcomm Reported Needs for Facilities in Small Communities Facilities 1 Needs (2008 Dollars, Millions) Population 2004 2008 2004 2008 0-999 20 18 $59 $51 1,000-3,499 24 22 $49 $160 3,500-10,000 10 6 $87 $50 Total 54 46 $194 $262 Visit www.epa.gov/cwns for more information including: Detailed Reports to Congress Other state fact sheets Maps, charts, and data downloads for projects, facilities, watersheds, counties, congressional districts, cities, states, and regions ------- |