Definitions and Abbreviations: 

Sample dates reflect the most recent required sample. Most samples are required every three years. 

< : less than 
C/100 ml: colonies per 100 milliliters 
Gr/gal: Grains Per Gallon: Water hardness measure 
EPA: United States Environmental Protection Agency 
MCL: Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water. MCL’s are set as close to the MCLGs as feasible using the best available treatment technology 
MCLG: Maximum Contaminant Level Goal: The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLG’s allow for a margin of safety 
MRDL: Maximum residual disinfectant level goal means the level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants. NA: not applicable 
ND: none detected 
NR: not required 
NTU - Nephelometric Turbidity Unit: measure of how light is scattered by particulate matter in water 
SD: single detect 
pCi/L - pico-Curies per Liter: a measure of radioactivity 
mg/L (milligrams per liter): Unit of measure equal to parts per million (PPM). 1 mg/L (or 1 PPM) is roughly equivalent to one penny in $10,000 
µg/L (micrograms per liter): Unit of measure equal to parts per billion (PPB). 1 µg/L (or 1 PPB) is roughly equivalent to one penny in $10,000,000 

2002 & 2003 Violations 

In 2002, the City of Peoria notified Maricopa County Environmental Services Department that after a review of the City’s water quality data, that the water system failed to obtain some of the required number of samples on the prescribed schedule for Regulated Volatile Organic Compounds (VOC) in 2001. This failure to monitor regulated drinking water contaminants is in violation of the Safe Drinking Water Rules. The City has collected the required VOC samples to address this issue. Laboratory results are complete and no detection of VOCs was found. In 2003, the City found that monitoring at one location after a detection of VOCs in the 4th quarter of 2002 did not increase as required. Sampling completed in the first quarter 2003 indicated no detection of VOCs at this same location. The City of Peoria will continue monitoring VOCs at this location per regulations. 

Public water systems are required by the U.S. Environmental Protection Agency (EPA), Arizona Department of Environmental Quality (ADEQ), and the Maricopa County Environmental Services Department to monitor the drinking water for Regulated Volatile Organic Compounds. Analysis of samples from eight wells that were collected during the above time periods were within the guidelines for safe drinking water established by EPA and ADEQ.

 For more information: City of Peoria: 623-773-7286 or waterquality@peoriaaz.gov EPA Safe Drinking Water Hotline: 1-800-426-4791 (toll free)