Decew Falls Water Treatment Plant - 2023 Summary Report

This report summarizes the water flows for the Decew Falls Water Treatment Plant, drinking water system number 220002066, from Jan. 1 to Dec. 31, 2023.

This report satisfies the requirements of Ontario Regulation 170/03 - Drinking Water Systems.

Inspection rating

The Decew Falls Water Treatment Plant was granted a 100 per cent inspection rating during the 2023 Ministry of Environment, Conservation and Parks annual drinking water system inspection.

Summary of non-compliance

The following instance of non-compliance was noted during the inspection: Administrative- non-compliance.

Event details

Section 3.2 of the 2020 Watermain Disinfection Procedure requires that the documentation, when using continuous disinfection method, includes the decreases in chlorine concentration after contact time in mg/L and in percentage for each sampling point. Although the Region's form specified the limits for the chlorine concentration decreases to ensure adequate disinfection, the individual decreases in concentrations for the two Form 1 projects were not written down on the forms or any other records.

Corrective actions

By June 30, the Region shall arrange to submit the following to a Water Inspector of the Ministry's Niagara District Office: An updated watermain commissioning form which include all the documentation required in Section 3.1 of the Watermain Disinfection Procedure, including at a minimum, columns for decrease in chlorine concentrations in mg/L and in percentage, and a list of the personnel who were trained on the updated watermain commissioning form.

Summary of water treatment plant flows

The flow rates captured below are moments in time, and can be affected by various circumstances, such as pump changes or valve position. It is not unusual to have higher or lower than normal flows for this reason.

Month Total flow raw (ML) Total flow treated (ML) Average day raw (ML) Average day treated (ML) Minimum day treated (ML) Maximum day treated (ML) Minimum flow rate treated (ML/d) Maximum flow rate treated (ML/d) Total waste sludge (ML)
Jan. 1717.153 1482.358 55.392 47.818 45.032 52.456 25.545 100.080 0.650
Feb. 1534.722 1314.136 54.812 46.933 44.454 50.353 26.964 94.302 6.157
March 1683.987 1462.044 54.322 47.163 44.500 50.714 24.740 86.363 4.943
April 1619.902 1428.135 53.997 47.605 44.991 52.034 18.150 74.638 3.122
May 1926.901 1703.873 62.158 54.964 46.689 70.611 22.229 86.820 0.737
June 2089.383 1841.016 69.646 61.367 53.102 73.327 37.576 90.956 6.070
July 2131.567 1869.602 68.760 60.310 52.653 72.679 35.697 88.016 0.731
Aug. 2031.898 1727.655 65.545 55.731 50.091 60.930 26.271 76.230 0.434
Sept. 2018.998 1733.258 67.300 57.775 49.145 69.715 18.365 92.992 0.650
Oct. 1819.948 1586.257 58.708 51.170 45.761 61.847 28.368 79.846 4.379
Nov. 1665.754 1474.804 55.525 49.160 45.885 54.266 23.629 72.338 3.209
Dec. 1838.049 1659.419 59.292 53.530 51.020 55.719 26.058 75.194 2.948

The flow rates are moments in time, and can be affected by various circumstances, such as pump changes or valve position and therefore not unusual to have higher or lower than normal flows.

Flow totals

  • Total flow raw was 22,078.262 ML
  • Total flow treated was 19,282.557 ML
  • Total waste sludge was 34.032 ML

Minimums

  • Minimum day treated was 44.454 ML
  • Minimum flow rate treated was 18.150 ML
  • Total waste sludge minimum was 0.434 ML

Maximums

  • Maximum day treated was 73.327 ML
  • Maximum flow rate treated was 100.080 ML
  • Total waste sludge maximum was 6.157 ML

Averages

  • Total average day raw was 60.455 ML
  • Total average day treated was 52.794 ML
  • Total waste sludge average was 2.836 ML

Comparison of actual to system approved flow

Flow rates are required by Municipal Drinking Water Licence number 007-102.

Maximum daily flow: 227.300 ML
Maximum flow rate: 227.300 ML/day

Month Average day treated (ML) Per cent of average day treated rated capacity Maximum day treated (ML) Per cent of maximum day treated rated capacity Maximum flow rate treated (ML/d) Per cent of maximum flow rate rated capacity
Jan. 47.818 21.0% 52.456 23.0% 100.080 44.0%
Feb. 46.933 20.6% 50.353 22.1% 94.302 41.4%
March 47.163 20.7% 50.714 22.8% 86.363 36.3%
April 47.605 20.9% 52.034 21.33% 74.638 32.8%
May 54.964 24.1% 70.611 31.0% 86.820 38.1%
June 61.367 26.9% 73.327 32.2% 90.956 40.0%
July 60.310 26.5% 72.679 31.9% 88.016 39.1%
Aug. 55.731 24.5% 60.930 26.8% 76.230 33.5%
Sept. 57.775 25.4% 69.715 30.6% 92.992 40.9%
Oct. 51.170 22.5% 61.847 27.2% 79.846 35.1%
Nov. 49.160 21.6% 54.266 23.8% 72.338 31.8%
Dec. 53.530 23.5% 55.719 24.5% 75.194 33.0%
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