Water Quality Data Table

Disinfectants & Disinfectant By-Products

Contaminants MCLG or MRDLG MCL, TT, or MRDL Your Water Range Low Range High Sample Date Violation Typical Source
TTHMs [Total Trihalomethanes] (ppb) NA 80 12.2 NA N/A
2014
No By-product of drinking water disinfection
Chlorine (as Cl2) (ppm) 4 4 1.13 0.9 1.28 2014 Water additive used to control microbes No
Haloacetic Acids (HAA5) (ppb)

NA 60 1.4 NA N/A
2014 No By-product of drinking water chlorination
Note: There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.

Microbiological Contaminants


Contaminants MCLG or MRDLG MCL, TT, or MRDL Your Water Range Low Range High Sample Date Violation Typical Source
Fluoride (ppm) 4 4 0.65 0.54 0.76 2014 No Erosion of natural deposits
Water additive which promotes strong teeth
Discharge from fertilizer and aluminum factories

Radioactive Contaminants


Contaminants MCLG or MRDLG MCL, TT, or MRDL Your Water Range Low Range High Sample Date Violation Typical Source
Radium (combined 226/228) (pCi/L) 0 5 1.15 ND 3 2014 No Erosion of natural deposits

Inorganic Contaminants


Contaminants MCLG AL Your Water Sample Date Number of Samples Exceeding AL Exceeds AL Typical Source
Copper - action level at consumer taps (ppm) 1.3 1.3 0.26 2013 0
No Corrosion of household plumbing systems
Erosion of natural deposits
Lead - action level at consumer taps (ppb) 0
15
3.5 2013 0
No Corrosion of household plumbing systems
Erosion of natural deposits

Unit Descriptions


  • ppm: Parts per million, or milligrams per liter (mg/L)
  • ppb: Parts per billion, or micrograms per liter (µg/L)
  • pCi/L: Picocuries per liter (a measure of radioactivity)
  • positive samples/month: Number of samples taken monthly that were found to be positive
  • NA: Not applicable
  • ND: Not detected
  • NR: Monitoring not required, but recommended

Important Drinking Water Definitions


  • MCLG: Maximum Contaminant Level Goal: 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
  • MCL: Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology
  • TT: Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water
  • AL: Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow
  • Variances and Exemptions: State or EPA permission not to meet an MCL or a treatment technique under certain conditions
  • MRDLG: Maximum residual disinfection level goal. 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
  • MRDL: Maximum residual disinfectant level. The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants
  • MNR: Monitored Not Regulated
  • MPL: State Assigned Maximum Permissible Level