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Iowa's Section 303(d) Impaired Waters Listings

Under Section 303(d) of the Clean Water Act, states are required from "time to time" to submit a list of waters for which effluent limits will not be sufficient to meet all state water quality standards. EPA has defined "time to time" to mean April 1 of even numbered years. The failure to meet water quality standards might be due to an individual pollutant, multiple pollutants, "pollution," or an unknown cause of impairment. The 303(d) listing process includes waters impaired by point sources and non-point sources of pollutants.

Iowa Source Water Protection Program

Source Water is a lake, stream, river or aquifer where drinking water is obtained. Source Water Protection (SWP) is the act of preventing contaminants from entering public drinking water sources. SWP includes both ground water (wellhead) protection and surface water protection. The IDNR SWP Program is a voluntary program and is divided into Targeted and Non-Targeted programs in order to provide better customer service to our Iowa Community Water Supplies (CWS).

Iowa's Stream Monitoring Program

Since October 1999, the Iowa Department of Natural Resources has maintained a network of stations to monitor water quality in the state. A total of 91 sites have been part of this network. However, the total number of stations monitored varies each year. The most stations sampled was in 2003-2006 when a total of 84 stream sites and 1 spring were sampled. Currently, a total of 75 stream sites and 1 spring are sampled.
 
 Generally, the sites in this network are sampled monthly.

Iowa's Beach Water Monitoring Program

Routine water quality monitoring is conducted at all of the State Park beaches and many locally managed beaches in Iowa. In order to help protect the health of those wishing to recreate at the beaches, the Iowa Department of Natural Resources works with various public health and management agencies throughout the state to inform the public of the most current water quality conditions. Outdoor recreation at beaches in Iowa is typically limited to the time period between Memorial Day and Labor Day.