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%