Fort Walton Beach — 2020 Consumer Water Quality Report — reading text

MCL Contaminant and Unit of sampling Violation Level Range of MCLG MCL Likely Source of Contamination understand these terms, we have provided the Measurement Detected Results following definitions: (mo./yr.) (Yes/No) Discharge of drilling wastes; discharge from metal refineries; n/a: not applicable Barium (ppm) April 2020 No 0.36 0.005-0.36 2 2 erosion of natural deposits ND: means not detected and indicates that the substance Erosion of natural deposits; discharge from fertilizer and aluminum was not found by laboratory analysis. Fluoride (ppm) April 2020 No 1.15 0.51-1.15 4 4.0 factories. Water additive which promotes strong teeth when at the Parts per million (ppm) or milligrams per liter (mg/l): optimum level of 0.7 ppm one part by weight of analyte to one million parts by weight Runoff from fertilizer use; leaching from septic tanks, sewage; of the water sample. Nitrate (as nitrogen) (ppm) April 2020 No 0.34 ND – 0.34 10 10 erosion of natural deposits. Parts per billion (ppb) or micrograms per liter (µg/l): Discharge from petroleum and metal refineries; erosion of natural Selenium (ppb) April 2020 No 4.0 ND – 4.0 50 50 one part by weight of analyte to one billion parts by weight deposits; discharge from mines. of the water sample. Sodium (ppm) April 2020 No 120 35-120 n/a 160 Saltwater intrusion, leaching from soil Picocuries per liter (pCi/L): measure of the radioactivity RADIOACTIVE CONTAMINANTS in water. Jan & May Action Level (AL): the concentration of a contaminant Alpha emitters (pCi/L) No 2.7 ND-2.7 0 15 Erosion of natural deposits 2017 which, if exceeded, triggers treatment or other requirements Radium 226 +228 or Jan & May which a water system must follow. No 1.36 0.4-1.36 0 5 Erosion of natural deposits combined radium (pCi/L) 2017 Maximum Contaminant Level or MCL: the highest level STAGE 2 DISINFECTANTS AND DISINFECTION BY-PRODUCTS . of a contaminant that is allowed in drinking water. MCLs MCL or are set as close to the MCLGs as feasible using the best Disinfectant or Dates of MRDL Level Range of MCLG or MCL or available treatment technology. Contaminant and Unit of sampling Likely Source of Contamination Violation Detected Results MRDLG MRDL Maximum Contaminant Level Goal or MCLG: the level Measurement (mo./yr.) (Yes/No) of a contaminant in drinking water below which there is no Jan-Dec known or expected risk to health. MCLGs allow for a Chlorine (ppm) Stage 1 No 0.81 0.63-1.0 MRDLG = 4 MRDL = 4.0 Water additive used to control microbes 2020 margin of safety. Haloacetic Acids (five) Maximum residual disinfectant level or MRDL: the July 2020 No 15.2 2.3-15.2 n/a MCL = 60 By-product of drinking water disinfection (HAA5) (ppb) highest level of a disinfectant allowed in drinking water. TTHM (Total There is convincing evidence that addition of a disinfectant July 2020 No 21.5 20.4-21.5 n/a MCL = 80 By-product of drinking water disinfection trihalomethanes) (ppb) is necessary for control of microbial contaminants. LEAD AND COPPER (TAP WATER) Maximum residual disinfectant level goal or MRDLG: Dates of AL 90th No. the level of a drinking water disinfectant below which there Contaminant and Unit of AL (Action is no known or expected risk to health. MRDLGs do not Sampling Exceeded Percentile Exceeding MCLG Likely Source of Contamination Measurement Level) reflect the benefits of the use of disinfectants to control (mo./yr.) (Yes/No) Result the AL Corrosion of household plumbing systems; erosion of natural microbial contaminants. Copper (tap water) (ppm) August 2020 No 0.17 0 of 30 1.3 1.3 deposits; leaching from wood preservatives Corrosion of household plumbing systems; erosion of natural Lead (tap water) (ppb) August 2020 No 5.2 0 of 30 0 15 deposits