Regulated Water Contaminants Surface Water Sources Including Seawater Desalination The results for the tables below are regulated by federal and state

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7 Regulated Water Contaminants Surface Water Sources Including Seawater Desalination The results for the tables below are regulated by federal and state agencies. For a complete list including unregulated contaminants, please call Compound and Unit of Measurement G Desal WTP (DESALEFF) Regional Surface Water WTP (RSWTPEFF) Level Detected Inorganic Contaminants: in the Column are the highest detected level at any sampling point Barium (ppm) N/A NO 4/ N/A NO 4/17 Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits. Fluoride (ppm) 4 4 no detect N/A NO 4/ N/A NO 4/17 Erosion of natural deposits; discharge from fertilizer and aluminum factories. Water additive which promotes strong teeth when at optimum levels between 0.7 and 1.3 ppm. Nitrate (ppm) no detect N/A NO 1/17 4/17 11/ NO 10/17 Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits. Sodium (ppm) 160 N/A 33.5 N/A NO 4/ N/A NO 4/17 Salt water intrusion, leaching from soil. Volatile organic contaminants Di(2-Ethylhexyl)Adipate (ppb) ND NO 5/17 11/ ND NO Di(2-Ethylhexyl)Phthalate (ppb) ND NO 5/17 11/ ND NO 10/17 10/17 Stage 1 disinfection/disinfection byproduct parameters: for bromate, the level detected is the highest running annual average (RAA), computed quarterly, of monthly averages of all samples collected. Disinfectant or Contaminant and Unit of Measurement or G or G or or Bromate (ppb) 10 0 N/A N/A NO N/A NO 1/17-12/17 Byproduct of drinking water chlorination. Stage 2 disinfection/disinfection byproduct parameters: systems that did not take their annual samples in the 3rd quarter should report their individual. Stage 2 D/DBPR results in the range column and nothing in the level detected column (NOTE 3). or Disinfectant or Contaminant and Unit of Measurement G HAA5 (ppb) 60 N/A N/A NO 10/17 N/A NO 10/17 Byproduct of drinking water chlorination. TTHMs (ppb) 80 N/A N/A NO 10/17 Byproduct of drinking water chlorination. Chlorite: for highest monthly average: three sample set collected in the distribution system. For highest average: three sample set collected in the distribution system following a daily exceedance at the entrance to the distribution sytem. Contaminant and Unit of Highest Monthly Highest Highest Monthly Highest Measurement G Average Average Average Average Chlorite (ppm) N/A NO 1/17-12/17 N/A N/A NO N/A Byproduct of drinking water chlorination. For chlorine dioxide, the level detected is the highest single measurement collected at the entrance to the distribution system. is at the entrance to the distribution system. Disinfectant and Unit of Measurement G *Non-Acute Acute Non-Acute Acute Chlorine Dioxide (ppb) NO NO 5/17 N/A N/A NO N/A Water additive used to control microbes. Radioactive contaminants: EPA considers 50 pci/l to be the level of concern for beta particles.* Beta results reported in pci/l. The level detected in the radioactive contaminants column is the highest detected level at the sampling point. Compound and Unit of Measurement G Radium (pci/l) N/A NO 4/ N/A NO 4/17 Erosion of natural deposits. Alpha emitters (pci/l) 15 0 no detect N/A NO 4/ N/A NO 4/17 Erosion of natural deposits. For turbidity: the result in the lowest monthly percentage column is the lowest monthly percentage of samples reported in the Monthly Operation Report meeeting the required turbidity limits. Contaminant and Unit of Measurement Highest Single Measure The Lowest Monthly Percentage of Samples Meeting Regulatory Limits Turbidity (NTU) TT N/A NO For TOC: lowest running annual average compiled quarterly, of monthy removal ratios. Contaminant and Unit of Measurement Monthly Removal Ratios Lowest Running Annual Avg Computed Quarterly Monthly Removal Ratio TT Total Organic Carbon(ppm) TT N/A NO Highest Single Measure The Lowest Monthly Percentage of Samples Meeting Regulatory Limits 1/17-6/17 11/17-12/ NO 1/17-12/17 Soil runoff. Lowest Running Annual Avg Computed Quarterly Monthly Removal Ratios Monthly Removal Ratio TT 1/17-6/17 11/17-12/ NO 1/17-12/17 Naturally present in the environment. Page 7

8 Regulated Water Contaminants Groundwater Sources Compound and Unit of Measurement G BUD5 WTP BUD5WTPEFF Inorganic Contaminants: in the Column are the highest detected level at any sampling point BUD7 WTP BUD7WTPEFF Morris Bridge WTP MBWTPEFF Lake Bridge to Reg LBWTPREG Cypress Creek WTP CCWTPEFF Maytum WTP MAYTUMEFF South Pasco WTP (SPWTPEFF) Arsenic (ppb) N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 Barium (ppm) N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/17 Chromium (ppb) no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 6 N/A NO 4/17 no detect N/A NO 4/17 Erosion of natural deposits; runoff from orchards;runoff from glass and electronic production wastes. Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits. Discharge from steel and pulp mills; erosion of natural deposits. Cyanide (ppb) no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 3 N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 Fluoride (ppm) N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/17 Lead POE (ppb) N/A ND NO 10/ ND NO Mercury (inorganic) (ppb) 2 2 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/ N/A NO 4/17 Nitrate (ppm) NO Nitrite (ppm) 1 1 no detect N/A NO 10/ NO 10/ ND NO 10/ ND-0.06 NO 10/ ND NO 10/ NO 10/ NO 10/ ND-0.16 NO 10/ ND-0.20 NO Selenium (ppb) N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 Sodium (ppm) 160 N/A 11 N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/17 Volatile organic contaminants. Carbon Tetrachloride (ppb) 0 3 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/ ND NO Synthetic organic contaminants including pesticides and herbicides. Di(2-Ethylhexyl)Adipate (ppb) no detect N/A NO 4/ ND-0.65 NO Di(2-Ethylhexyl)Phthalate (ppb) 6 6 no detect N/A NO 4/ ND-0.65 NO 4/17 7/17 10/ ND NO 4/17 7/17 10/ ND NO Stage 2 disinfection/disinfection byproduct parameters: systems that did not take their annual samples in the 3rd quarter should report their individual Stage 2 D/DBPR results in the range column and nothing in the level detected column (NOTE 3). Disinfectant or Contaminant and Unit of Measurement G or or or HAA5 (ppb) 60 N/A N/A NO TTHMs (ppb) 80 N/A N/A NO 10/17 N/A NO 10/17 N/A NO Radioactive contaminants: EPA considers 50 pci/l to be the level of concern for beta particles.the level detected in the radioactive contaminants column is the highest detected level at the sampling point. Compound and Unit of Measurement G 10/ ND NO 10/ ND NO or 10/17 N/A NO 10/ ND NO 10/ ND NO or 10/17 N/A NO 1/17 4/17 7/17 11/17 1/17 4/17 7/17 11/17 1/17 4/17 7/17 11/17 4/17 7/17 11/17 4/17 no detect N/A NO 4/17 4/17 no detect N/A NO 4/17 or 10/17 N/A NO or 10/17 N/A NO Discharge from steel/metal factories; discharge from plastic and fertilizer factories. Erosion of natural deposits; discharge from fertilizer and aluminum factories. Water additive which promotes strong teeth when at optimum levels between 0.7 and 1.3 ppm. Residue from man-made pollution such as auto emissions and paint; lead pipe, casing, and solder. Erosion of natural deposits; discharge from refineries and factories; runoff from landfills; runoff from cropland. Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits. Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits. Discharge from petroleum and metal refineries; erosion of natural deposits; discharge from mines. Salt water intrusion, leaching from soil. Discharge from chemical plants and other industrial activities. Discharge from chemical factories. Discharge from rubber and chemical factories. Byproduct of drinking water 10/17 chlorination. Byproduct of drinking water 10/17 chlorination. Alpha emitters (pci/l) 15 0 no detect N/A NO 4/17 no detect N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 Erosion of natural deposits. Radium (pci/l) N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/ N/A NO 4/17 no detect N/A NO 4/17 Erosion of natural deposits. Uranium (ug/l) N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 no detect N/A NO 4/17 Erosion of natural deposits. Footnotes and Definitions: 1 Maximum Contaminant Level or : The highest level of a contaminant that is allowed in drinking water. s are set as close to the Gs as feasible using the best available treatment technology. Maximum Contaminant Level Goal or G: The level of a contaminant in drinking water below which there is no known or expected risk to health. Gs allow for a margin of safety. Maximum Residual Disinfectant Level or : The highest level of a disinfectant allowing in drinking water. There is convincing evidence that addition of a disinfectant is neccesary for control of microbial contaminants. Maximum Residual Disinfectant Level Goal or G: The level of a drinking water disinfectant below which there is no known or expected risk to health. Gs to not reflect the benefits of the use of disinfectants to control microbial contaminants. mrem/year: millirems per year ( a measure of radiation absorbed by the body) N/A: Not applicable Not detected: indicates the substance was not found by laboratory analysis. Nephelometric Turbidity Units (NTU): Measure of the clarity of water. Turbidity in excess of 5 NTU is just noticeable to the average person. Parts per million or (ppm) or Milligrams per liter (Mg/L): One part of weight of analyte to 1 million parts by weight of the water sample. Parts per billion or (ppb) or Micrograms per liter (ug/l): One part by weight of analyte to 1 billion parts by weight of the water sample. Picocurie per liter (pci/l): Measure of the radioactivity in water. Treatment Technique or TT: A required process intended to reduce the level of a contaminant in drinking water. Page 6