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s Drinking Water Qualm : 1999 Test Results PAGE 3 In 1999, OWASA tested drinking water for over 100 substances in accord with State and Federal requirements. Listed below are the only substances that were detected, all of which were below the regulatory limits. To get a list of all test results including substances not detected, please call us at 9684421 or see our Web site, www. owasa. org. Glossary : Definitions for words and acronyms used below Maximum Contaminant Level Goal (MCLG) - the level Picocuries per liter (pCYL) - a measure of the radioac- of a contaminant in drinking water below which there is tivity in water. (A picocune is one quadrillionth of a curie . ) r no known or expected risk to health . MCLGs allow for a margin of safety. Nephelometric Turbidity Unit (NTU) - a measure of the clarity of water. Turbidity over 5 NTU is just notice ,,, Maximum Contaminant Level (MCL) - the highest level able to the average person . of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best Action Level (AL) - the concentration of a contaminant available treatment technology. which , if exceeded , triggers treatment or other require Parts per million (ppm) - one part per million corre- ments which a water system must follow, sponds to one minute in two years or a single penny in -$ 101000 . Treatment Technique (77) - a required process intended to reduce the level of a contaminant in drinking water. Parts per billion (ppb) - one part per billion corresponds to one minute in 2 , 000 years , or one penny in $ 10 million . Levels and Types of Substances found in 1999 Drinking Water Tests Substance Highest Level Ran a Maximum Max . Flow 1. Detected (ex- g Contaminant Contami - Major Sources in eaunit of ( measurement Detected nant Level Drinking Water Ji ) cept as noted) Level Goal t . y Microbiological Substances r Turbidity ( NTU ) 0 . 28 ; 100 % of 0 . 01 - 0 . 28 TT = 5 n /a Soil runoff samples <_ 0 . 5 Radiological Substances Beta/ Photon Emitters 4 . 34 no range 50 0 Decay of natural and ( pCi/ L) artificial deposits Ilk Inorganic Substances Barium ( ppm ) 0 . 023 0 . 018 -0 . 023 2 2 Erosion of natural deposits Copper 90% of samples Action Level : Corrosion of household 5 0 . 193 * ; none 0 . 016 - 0 . 339 1 . 3 1 . 3 plumbing systems , erosion of ( ppb) above AL natural deposits , Leaching from wood preservatives Flouride 1 . 15 4 4 Erosion of natural depos- s. 1 . 10 - 1 . 15 its ; water additive which ( ppm ) promotes strong teeth rl Lead 90 % of samples Action Level : 0 Corrosion of household ( ppb ) <_ 3* ; none above 3 - 7 15 plumbing systems , ero - Action Level sion of natural deposits 'r Sodium ( ppm ) 23 no range Elements that occur not regulated natural ) in soils If Sulfate ( ppm ) 35 18 - 35 y Volatile Organic Substances r Total Trihalomethanes 69 . 8 40 . 9 - 112 . 7 100 n�a By- products of drinking ( ppb) yearly running avg , yearly running avg . * water chlorination Unregulated Volatile Organic Substances Bromodichloromethane 8 . 2 ppb Components of trihalomethanes , a by- Chloroform 44 . 3 ppb no range not regulated product of drinking water Chlorodibromomethane 1 . 5 ppb chlorination * These items are listed on a 90th percentile or running average basis in accord with federal reporting requirements . All of the data reported above are in a required format . rl All drinking water, including bottled drinking water, may be reasonably expected to contain at least small amounts of some contaminants . The presence of these contaminants does not necessarily pose a health risk . The t Environmental Protection Agency limits the amount of certain contaminants in water from public drinking y. : water systems . The Food and Drug Administration sets limits for contaminants in bottled water to provide the J. ' f . same protection for the public health .