Key to the Iowa City
1997 Drinking Water Quality Summary

Iowa City/Coralville Area Online Resource
Brought to you by JEONET.

The "Maximum Allowed" is the highest amount allowed.

An asterisk (***) maximum peak annual average.

(**) denotes a maximum based on a rolling average.
(*) denotes monthly average of sample results.

"TT" means a treatment technique is required, such as filtration.

N/A means not applicable.

Parts per Million (ppm) - One part per million (or milligram per liter) corresponds to one minute in two years or one penny in $10,000

Parts per Billion (ppb) - One part per billion (or microgram per liter) corresponds to 1 minute in 2,000 years, or a single penny in $10,000,000.

Picocuries per Liter (pCi/L) - Picocuries per liter is a measure of the radioactivity in water

Nephelometric Turbidity Unit (NTU) - Nephelometric Turbidity Unit is a measure of the clarity of water. Turbidity in excess of 5 NTU is just noticeable to the average person. Drinking water turbidity is measured by Nephlometric Turbidity Units (NTU). 95% of samples collected in a monthly reporting period must be less than or equal to 0.5 NTU and that all turbidity readings must be less than or equal to 5.0 NTU.

MPN/100mL - Most Probable Number per 100 milliliters.