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EF/ICR Logo Query Form

Search for Microbial and Disinfection Byproduct (DBP) Information

The Information Collection Rule (ICR) query form allows you to retrieve disinfection byproduct and microbial reports at the national, state, and utility levels.


The ICR data were collected as part of a national research project to support development of national drinking water standards. They should NOT be used to determine local water systems compliance with drinking water standards, nor should they be used to make personal judgements about individual health risks.

The ICR data were collected from July 1997 to December 1998. All the data have been verified, and the database is complete. EPA will use the data to identify national and regional patterns, not to reach system-by-system or treatment plant-by-treatment plant conclusions. The data that you will see are from individual samples. What EPA will evaluate is the degree to which the samples represent overall water quality.

Several states (and two U.S. territories) did not participate in the ICR: Montana, North Dakota, Vermont, Wyoming, the Virgin Islands, and Guam.

User's Guide

National Level:

Please select the report you would like to see. Reports are available for both disinfection byproducts and microbials.


National levels of Cryptosporidium.
National levels of Giardia.
National levels of virus.
National levels of total coliform.
National levels of fecal coliform.
National levels of E. Coli.

        Disinfection Byproducts

National levels of bromate.
National levels of chlorite.
National levels of trihalomethanes.
National levels of haloacetic acids.

State Level:

To retrieve State or Utility level disinfection byproduct or microbial reports, click a state on the map or text links below.

Several states (and two U.S. territories) did not participate in the ICR: Montana, North Dakota, Vermont, Wyoming, the Virgin Islands, and Guam.

Click on a state
Washington Oregon Nevada Arizona Utah Idaho Colorado New Mexico South Dakota Nebraska Kansas Oklahoma Minnesota Iowa Montana Arkansas Louisiana Wisconsin Illinois Indiana Ohio Kentucky Tennessee Mississippi Alabama Florida Georgia South Carolina North Carolina Virgina West Virginia Pennsylvania New York New York Maine Michigan Alaska Hawaii Puerto Rico California Texas New Hampshire Massachusetts Connecticut New Jersey Rhode Island Rhode Island Massachusetts New Hampshire Delaware Delaware Maryland Washington D.C Maryland
Alaska | Alabama | Arkansas | Arizona | California | Colorado | Connecticut | District of Columbia | Delaware | Florida | Georgia | Guam | Hawaii | Iowa | Idaho | Illinois | Indiana | Kansas | Kentucky | Louisiana | Maine | Maryland | Massachusetts | Michigan | Minnesota | Mississippi | Missouri| Montana | North Carolina | North Dakota | Nebraska | Nevada | New Hampshire | New Jersey | New Mexico | New York | Ohio | Oklahoma | Oregon | Pennsylvania | Puerto Rico | Rhode Island | South Carolina | South Dakota | Tennessee | Texas | Utah | Virginia | Virgin Islands | Vermont | Washington | Wisconsin | West Virginia | Wyoming |

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