Welland Water Treatment Plant - 2019 Summary Report

Prepared under Ontario Regulation 170/03

The Welland Water Treatment Plant was found to be in non-compliance with regulations and/or system Licensed, as follows:

  • On Aug. 3, 2018, following non-invasive maintenance work within the Bemis Elevated Tank, a two-phase tank disinfection, the thank was filled with treated water in order to meet water retention requirements for phase two. During the second phase, a watermain break caused a decrease in system pressure resulting in a release of approximately 0.193 ML of improperly disinfected water to the distribution system. Following the release, sampling results from Niagara Region and the City of Welland were negative for bacteriological parameters, meeting provincial requirements. The event was not reported to the Medical Officer of Health or the Spills Action Centre. Upon internal review, incident details were provided to Public Health and the Ministry of Environment, Conservation and Parks for review. Public Health was satisfied that the drinking water remained safe during and after the incident.
  • On Nov. 29, 2018 Niagara Region reported to the Spills Action centre, that on Aug. 3, 2018, a release of approximately 0.193 ML of improperly disinfected water occurred at the Bemis Elevated Tank while the Region was performing the disinfection of the tank.
  • Details of the incident, internal procedures, the disinfection requirements of the Drinking Water Works permit, and reported requirements from Section 16-4 were reviewed with pertinent staff.

Summary of Flows

Date Total Flow Raw (ML) Total Flow Treated (ML) Average Day Raw (ML) Average Day Treated (ML) Maximum Day Treated (ML) Minimum Day Treated (ML) Maximum Flow Rate Treated (ML/d) Minimum Flow Rate Treated (ML/d) Waste Sludge (ML)
Jan 663.870 21.415 21.016 23.954 18.654 41.500 25.644 22.975 21.345
Feb 614.750 597.235 21.955 21.363 25.025 18.460 42.794 19.525 27.640
Mar 679.410 667.126 21.916 21.551 25.162 19.000 42.431 20.109 22.781
Apr 640.200 627.266 21.340 20.941 23.448 19.444 42.562 20.062 23.395
May 694.010 669.421 22.387 21.634 24.422 17.556 47.666 23.688 34.338
Jun 713.800 691.059 23.793 23.076 26.331 19.380 43.312 22.341 39.256
Jul 858.750 835.247 27.702 26.987 31.300 22.168 43.744 14.969 40.244
Aug 796.380 787.374 25.690 25.441 28.782 21.886 46.612 14.413 26.939
Sep 703.560 690.526 23.452 23.053 28.480 18.718 46.594 6.095 29.116
Oct 707.110 677.685 22.810 21.888 32.400 12.760 42.031 24.731 18.706
Nov 727.160 649.755 24.239 21.681 24.680 19.806 42.725 6.456 18.796
Dec 713.820 691.082 23.026 22.317 25.614 19.888 42.956 18.276 33.557
Total 8512.820 8234.307             304.186
Minimum           12.760   6.095 18.706
Maximum         32.400   47.666   304.186
Average     23.311 22.579         25.349

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.

Comparison of Actual to System Approved Flow

Flow rates as set in the Municipal Drinking Water Licence # 007-104 and Drinking Water Works Permit # 007-204.

Maximum daily flow: 65.000 ML
Maximum flow rate: 65.000 ML/day

Date Average Day Treated (ML) % of Rated Capacity Maximum Day Treated (ML) % of Rated Capacity Maximum Flow Rate Treated (ML/d) % of Rated Capacity
Jan 21.016 32.3% 23.954 36.9% 41.5 63.8%
Feb 21.363 32.9% 25.025 38.5% 42.794 65.8%
Mar 21.551 33.2% 25.162 38.7% 42.431 65.3%
Apr 20.941 32.2% 23.448 36.1% 42.562 65.5%
May 21.634 33.3% 24.422 37.6% 47.666 73.3%
Jun 23.076 35.5% 26.331 40.5% 43.312 66.6%
Jul 26.987 41.5% 31.3 48.2% 43.744 67.3%
Aug 25.441 39.1% 28.782 44.3% 46.612 71.7%
Sep 23.053 35.5% 28.48 43.8% 46.594 71.7%
Oct 21.888 33.7% 32.4 49.8% 42.031 64.7%
Nov 21.681 33.4% 24.68 38.0% 42.725 65.7%
Dec 22.317 34.3% 25.614 39.4% 42.956 66.1%
Page Feedback Did you find what you were looking for today?