Welland Water Treatment Plant - 2025 Summary Report

This report summarizes the water flows for the Welland Water Treatment Plant, drinking water system number 220002048, from Jan. 1 to Dec. 31, 2025.

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

Inspection rating

The Welland Water Treatment Plant was granted a 100 per cent inspection rating during the 2025-2026 Ministry of Environment, Conservation and Parks annual drinking water system inspection.

Summary of non-compliance

The Welland Water Treatment Plant was operated in such a way that at no time did it fail to meet or exceed the requirements of the Safe Drinking Water Act, associated regulations, the system's approval or any order that may have been issued for this reporting period.

Summary of water treatment plant flows

The flow rates captured 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)
January	806.670	787.068	26.022	25.389	22.288	29.868	24.845	43.475	28.304
February	767.390	745.012	27.407	26.608	20.812	38.060	24.769	46.094	33.091
March	810.270	785.448	26.138	25.337	22.868	27.920	24.665	43.625	36.429
April	784.360	743.652	26.145	24.788	21.877	27.464	24.114	42.963	52.881
May	827.110	795.460	26.681	25.660	22.054	30.964	19.275	43.338	40.096
June	932.660	904.640	31.089	30.155	24.804	37.502	23.837	46.835	44.828
July	1000.570	968.188	32.276	31.232	26.336	38.676	20.636	45.612	49.329
August	970.800	938.020	31.316	30.259	22.882	37.480	12.837	43.213	49.928
September	864.020	835.108	28.801	27.837	24.728	31.440	19.969	43.244	42.606
October	806.700	787.182	26.023	25.393	23.252	29.286	17.869	42.894	25.675
November	752.830	726.570	25.094	24.219	18.660	27.988	23.955	42.538	31.880
December	829.040	799.772	26.743	25.799	20.920	27.710	26.194	42.006	39.153

Flow totals

Total flow raw was 10152.420 ML
Total flow treated was 9816.120 ML
Total waste sludge was 474.200 ML

Minimums

Minimum day treated was 18.660 ML
Minimum flow rate treated was 18.856 ML/day
Total waste sludge minimum was 25.675 ML

Maximums

Maximum day treated was 38.676 ML
Maximum flow rate treated was 46.835 ML/day
Total waste sludge maximum was 49.928 ML

Averages

Total average day raw was 27.811 ML
Total average day treated was 26.890 ML
Total waste sludge average was 39.517 ML

Comparison of actual to system approved flow

Flow rates are required by Municipal Drinking Water Licence number 007-104.

Maximum daily flow: 65.000 ML
Maximum flow rate: 65.000 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
January	25.389	39%	29.868	46%	43.475	67%
February	26.608	41%	38.060	59%	46.094	71%
March	25.337	39%	27.920	43%	43.625	67%
April	24.788	38%	27.464	42%	42.963	66%
May	25.660	39%	30.964	48%	43.338	67%
June	30.155	46%	37.502	58%	46.835	72%
July	31.232	48%	38.676	60%	45.612	70%
August	30.259	47%	37.480	58%	43.213	66%
September	27.837	43%	31.440	48%	43.244	67%
October	25.393	39%	29.286	45%	42.894	66%
November	24.219	37%	27.988	43%	42.538	65%
December	25.799	40%	27.710	43%	42.006	65%