This report contains important information regarding the water quality in our water system. The source of our water is groundwater. Our groundwater is drawn from the Silurian and Cambrian Jordan Sandstone aquifers. Our water quality testing shows the following results:

Note: Contaminants with dates indicate results from the most recent testing done in accordance with regulations.

• Maximum Contaminant Level (MCL) – The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
• Maximum Contaminant Level Goal (MCLG) -- The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
• ppb -- parts per billion.
• ppm -- parts per million.
• pCi/L – picocuries per liter
• N/A – Not applicable
• ND -- Not detected
• Treatment Technique (TT) – A required process intended to reduce the level of a contaminant in drinking water.
• Action Level (AL) – The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water posed a health risk. More information about contaminants or potential health effects can be obtained by calling the Environmental Protection Agency’s Safe Drinking Water Hotline (800-426-4791).

Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. EPA/CDC guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (800-426-4791).

The North Liberty water supply obtains its water from the Cambrian Jordan Sandstone and Silurian aquifer. The Cambrian Jordan Sandstone and Silurian aquifer was determined to be not susceptible to contamination because the characteristics of the aquifer and overlying materials prevent easy access of contaminants to the aquifer. The wells will not be susceptible to most contaminant sources except through pathways to the aquifer such as abandoned or poorly maintained wells. A detailed evaluation of your source water was completed by the IDNR, and is available from Michael Keating at 319/626-5719.

For questions regarding this information, please contact Michael Keating at 319/626-5719 during the following hours: 7am – 3:30pm Monday - Friday.

Decisions regarding the water system are made at the City Council meetings held on the second and fourth Tuesday of each month at 7:00 p.m. at City Council Chambers, 25 West Cherry Street, and are open to the public.