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Terms and Their Meanings

Maximum Contamination Level (MCL) – The highest level of a contaminant that is allowed in drinking water. California is a Primacy State and may adopt federal standards or set standards that are more stringent. MCLs are set as close to the PHGs and MCLGs as is economically or technologically feasible.

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 and are set by the U.S. Environmental Protection Agency.

Public Health Goal (PHG) – The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency.

Primary Drinking Water Standard (PDWS) – Primary MCLs, specific treatment techniques adopted in lieu of primary MCLs, and monitoring and reporting requirements for MCLs that are specific in regulation.

Parts Per Million (PPM) – One part per million corresponds to one minute in two years or one penny in $10,000.

Parts Per Billion (PPB) – One part per billion corresponds to one minute in 2,000 years or one penny in 10,000,000.

PicoCuries Per liter (pCi/l) – A measure of the radioactivity in the water.

ND – Not detected at the detection limit for reporting.

NR – No testing required.

NS – No standard set at this time.

NTU – Nephelometric Turbidity Units – a measure of cloudiness.

< - Means “less than,” for example, <.02 means the lowest detectable level is .02 and that the contaminant was not detected.

* - Corrected for Uranium activity.

** - Fluoride Standard depends on temperature. The MCL was raised for EVWD.

a - Data from the entire distribution system.

b - One test per constituent; therefore, no range available.

Waived – This substance does not occur locally, so testing for it is not required.

Note for individuals with severely weakened immune systems:
Cryptosporidium, a rarely-occurring waterborne disease, can have serious health effects on cancer patients undergoing chemotherapy, people with AIDS, and others with severely compromised immune systems. People with any of these conditions should consult a doctor about this matter.

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