Grimsby Water Treatment Plant - 2025 Summary Report

This report summarizes the water flows for the Grimsby Water Treatment Plant, drinking water system number 220007150, from Jan. 1 to Dec. 31, 2025.

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

Inspection rating

The Grimsby 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 Grimsby 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	430.847	408.044	13.898	13.190	12.098	14.968	0.000	19.395	0.696
February	410.312	388.791	14.654	13.903	12.654	16.195	6.767	18.248	0.695
March	443.378	422.383	14.303	13.660	12.718	15.101	0.000	24.504	0.783
April	437.983	414.003	14.599	13.844	12.724	15.018	0.000	18.124	1.865
May	491.279	467.932	15.848	15.140	13.351	17.538	0.000	21.705	0.783
June	580.637	557.111	19.355	18.619	14.912	21.452	4.341	33.114	1.084
July	642.744	619.102	20.734	20.017	18.058	22.042	12.672	24.577	1.213
August	618.632	593.906	19.956	19.201	14.007	23.330	0.267	28.611	1.213
September	519.725	498.231	17.324	16.651	14.774	18.482	11.249	23.131	1.127
October	466.163	441.372	15.038	14.279	11.891	16.021	0.000	19.768	2.212
November	422.373	399.010	14.079	13.343	12.558	15.111	0.000	20.570	0.696
December	438.562	414.584	14.147	13.439	11.377	14.774	6.459	19.757	0.955

Flow totals

Total flow raw was 5,902.635 ML
Total flow treated was 5,624.469 ML
Total waste sludge was 13.322 ML

Minimums

Minimum day treated was 11.377 ML
Minimum flow rate treated was 0.000 ML/day
Total waste sludge minimum was 0.695 ML

Maximums

Maximum day treated was 23.330 ML
Maximum flow rate treated was 33.114 ML/day
Total waste sludge maximum was 2.212 ML

Averages

Total average day raw was 16.161 ML
Total average day treated was 15.440 ML
Total waste sludge average was 1.110 ML

Comparison of actual to system approved flow

Flow rates are required by Municipal Drinking Water Licence number 007-105.

Maximum daily flow: 44.000 ML
Maximum flow rate: 44.000 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	13.190	30%	14.968	34%	19.395	44%
February	13.903	32%	16.195	37%	18.248	41%
March	13.660	31%	15.101	34%	24.504	56%
April	13.844	31%	15.018	34%	18.124	41%
May	15.140	34%	17.538	40%	21.705	49%
June	18.619	42%	21.452	49%	33.114	75%
July	20.017	45%	22.042	50%	24.577	56%
August	19.201	44%	23.330	53%	28.611	65%
September	16.651	38%	18.482	42%	23.131	53%
October	14.279	32%	16.021	36%	19.768	45%
November	13.343	30%	15.111	34%	20.570	47%
December	13.439	31%	14.774	34%	19.757	45%