Decew Falls Water Treatment Plant - 2016 Annual Water Quality Report

The Annual Water Quality Report summarizes the quality of drinking water from the Decew Falls Water Treatment Plant from January 1 to December 31, 2016.

The Decew Falls Water Treatment Plant Summary Report is available for inspection.

Description of Drinking Water System

A conventional surface water treatment plant incorporates the following steps in its purification process:

  • Zebra mussel control
  • Travelling screens
  • Coagulation
  • Flocculation
  • Sedimentation
  • Filtration
  • Disinfection

A conventional surface water treatment plant which incorporates Zebra mussel control, travelling screens, coagulation, flocculation, sedimentation, filtration and disinfection in its process consisting of three separate treatment trains; referred to as Plant 1, Plant 2, and Plant 3, with a combined rated capacity of 227,300 m³/day. Primary disinfection is achieved utilizing Sodium Hypochlorite with Ultraviolet light as enhancement. The DeCew Falls Water Treatment Plant supplies drinking water to the City of St. Catharines, City of Thorold, Town of Niagara-on-the-Lake, and sections of the Town of Lincoln, and is located at 2700 DeCew Rd. (NAD83: Zone 17N, 641289.74m E and 4774591.422m N).

The water treatment chemicals used over this reporting period are:

  • Sodium Hypochlorite
  • Aluminum Sulphate

Monetary Expenses Incurred

To ensure safe and efficient operations, the following major repairs or upgrade projects took place:

  • Decew Falls WTP - upgrade completion, assessments, and design approximately $303,000
  • Queenston Reservoir Decommissioning approximately $67,000

Water Quality Test Results

Microbiological

Total Coliform and E.coli bacteria tests are performed on raw, treated and distributed drinking water.

Microbiological testing done under the Schedule 10, 11 or 12 of Regulation 170/03, during this reporting period.

Test Number of Samples Range of E.Coli or Fecal Results (minimim number)-(maximum number) Range of Total Coliform Results (minimim number)-(maximum number) Number of HPC* Samples Range of HPC Results (minimim number)-(maximum number)
Raw 52 0-47 0-980 Not applicable Not applicable
Treated 158 0-0 0-1 158 0-103
Distribution 312 0-0 0-0 312 0-35

*HPC (heterotrophic plate count) bacteria indicate biological growth. They are not harmful to humans and do not represent poor drinking water quality.

Operational

Operational testing done under Schedule 7, 8 or 9 of Regulation 170/03 during the period covered by this Annual Report.

Test Number of Samples Range of Results (minimim number)-(maximum number)
Turbidity 8760 0.018-0.552 NTU*
Chlorine 8760 0.56-2.00 mg/L
Fluoride Not applicable  

*NTU (nephelometric turbidity units) is a unit that measures the lack of water clarity.

An analyzer continuously monitors the water treatment process and records results on a predetermined frequency. Continuous monitors use 8760 as the number of samples.


Summary of additional testing and sampling carried out in accordance with the requirement of an approval, order or other legal instrument.

Date of legal instrument issued Parameter Date Sampled Result Unit of Measure
Municipal Drinking Water Licence: August 26, 2014 Total Suspended Solids Weekly Annual Average* 20.000 mg/L

Inorganics

Inorganic substances include heavy metals and dissolved minerals that may be present in treated drinking water. The following is a summary of inorganic parameters tested or the most recent sample results.

Parameter Sample Date Result Value Unit of Measure Exceedance
Antimony Nov. 23, 2016 <0.5 μg/L 0
Arsenic Nov. 23, 2016 <1.0 μg/L 0
Barium Nov. 23, 2016 18.9 μg/L 0
Boron Nov. 23, 2016 20.0 μg/L 0
Cadmium Nov. 23, 2016 <0.1 μg/L 0
Chromium Nov. 23, 2016 <1.0 μg/L 0
Mercury Nov. 23, 2016 <0. 1 μg/L 0
Selenium Nov. 23, 2016 <1.0 μg/L 0
Sodium Dec. 7, 2016 11.8 mg/L 0
Uranium Nov. 23, 2016 <1.0 μg/L 0
Fluoride Dec. 7, 2016 <0.1 mg/L 0
Nitrite Dec. 7, 2016 <0.05 mg/L 0
Nitrate Dec. 7, 2016 0.1 mg/L 0

Summary of lead testing under Schedule 15.1 during this reporting period
(applicable to the following drinking water systems; large municipal residential systems, small municipal residential systems, and non-municipal year-round residential systems)

Location Type Number of Samples Range of Lead Results (min to max) Unit of Measure Exceedance
Plumbing 4 0 - <0.1 µg/L 0
Distribution 4 0 - <0.1 µg/L 0

Organics

Trace organic test parameters include: volatile organic substances, pesticides, solvents, dioxins, PCB's, and disinfection by-products. The following is a summary of organic parameters tested or the most recent sample results.

Parameter Sample Date Result Value Unit of Measure Exceedance
Alachlor Nov 23, 2016 <0.4 μg/L 0
Atrazine + N-dealkylated metobolites Nov. 23, 2016 <0.9 μg/L 0
Azinphos-methyl Nov. 23, 2016 <0.3 μg/L 0
Benzene Nov. 23, 2016 <0.2 μg/L 0
Benzo(a)pyrene Nov. 23, 2016 <0.005 μg/L 0
Bromoxynil Nov. 23, 2016 <0.09 μg/L 0
Carbaryl Nov. 23, 2016 <1.0 μg/L 0
Carbofuran Nov. 23, 2016 <1.0 μg/L 0
Carbon Tetrachloride Nov. 23, 2016 <0.2 μg/L 0
Chlorpyrifos Nov. 23, 2016 <0.3 μg/L 0
Diazinon Nov. 23, 2016 <0.3 μg/L 0
Dicamba Nov. 23, 2016 <0.08 μg/L 0
1,2-Dichlorobenzene Nov. 23, 2016 <0.2 μg/L 0
1,4-Dichlorobenzene Nov. 23, 2016 <0.3 μg/L 0
1,2-Dichloroethane Nov. 23, 2016 <0.2 μg/L 0
1,1-Dichloroethylene (vinylidene chloride) Nov. 23, 2016 <0.3 μg/L 0
Dichloromethane Nov. 23, 2016 <1.0 μg/L 0
2-4 Dichlorophenol Nov. 23, 2016 <0.2 μg/L 0
2,4-Dichlorophenoxy acetic acid (2,4-D) Nov. 23, 2016 <0.08 μg/L 0
Diclofop-methyl Nov. 23, 2016 <0.08 μg/L 0
Dimethoate Nov. 23, 2016 <0.3 μg/L 0
Diquat Nov. 23, 2016 <7.0 μg/L 0
Diuron Nov. 23, 2016 <6.0 μg/L 0
Glyphosate Nov. 23, 2016 <20.0 μg/L 0
Malathion Nov. 23, 2016 <0.3 μg/L 0
2-Methyl-4-chlorophenoxyacetic acid (MPCA) Nov. 23, 2016 <10.0 μg/L 0
Metolachlor Nov. 23, 2016 <0.2 μg/L 0
Metribuzin Nov. 23, 2016 <0.2 μg/L 0
Monochlorobenzene Nov. 23, 2016 <0.5 μg/L 0
Paraquat Nov. 23, 2016 <1.0 μg/L 0
Pentachlorophenol Nov. 23, 2016 <0.3 μg/L 0
Phorate Nov. 23, 2016 <0.2 μg/L 0
Picloram Nov. 23, 2016 <0.08 μg/L 0
Polychlorinated Biphenyls(PCB) Nov. 23, 2016 <0.06 μg/L 0
Prometryne Nov. 23, 2016 <0.1 μg/L 0
Simazine Nov. 23, 2016 <0.3 μg/L 0
THM Annual Average 32.66 μg/L 0
Terbufos Nov. 23, 2016 <0.2 μg/L 0
Tetrachloroethylene Nov. 23, 2016 <0.3 μg/L 0
2,3,4,6-Tetrachlorophenol Nov. 23, 2016 <0.3 μg/L 0
Triallate Nov. 23, 2016 <0.2 μg/L 0
Trichloroethylene Nov. 23, 2016 <0.2 μg/L 0
2,4,6-Trichlorophenol Nov. 23, 2016 <0.2 μg/L 0
Trifluralin Nov. 23, 2016 <0.2 μg/L 0
Vinyl Chloride Nov. 23, 2016 <0.2 μg/L 0

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