Decew Falls Water Treatment Plant - 2025 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, 2025.

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 2025-2026 Ministry of Environment, Conservation and Parks annual drinking water system inspection.

Summary of non-compliance

The Decew Falls 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	1834.051	1666.730	59.163	53.765	48.400	58.446	27.288	76.287	0.477
February	1681.999	1529.838	60.071	54.637	50.635	67.968	28.071	83.352	0.607
March	1822.615	1658.811	58.794	53.510	50.666	58.275	27.782	79.170	3.425
April	1729.636	1567.917	57.655	52.264	50.151	54.933	22.675	77.088	3.079
May	1865.914	1690.731	60.191	54.540	50.304	60.835	26.491	80.235	6.677
June	2117.660	1965.511	70.589	65.517	57.906	79.881	33.608	101.285	0.737
July	2363.518	2197.732	76.243	70.895	58.632	80.253	39.321	104.406	0.867
August	2299.206	2151.555	74.168	69.405	56.918	87.019	36.806	112.852	0.780
September	1948.698	1838.381	64.957	61.279	54.244	69.675	35.333	98.133	6.679
October	1912.874	1757.378	61.706	56.690	52.193	62.777	23.346	99.855	2.082
November	1743.082	1561.089	58.103	52.036	48.426	56.016	20.797	77.016	7.458
December	1802.169	1598.393	58.134	51.561	47.077	56.565	21.999	82.212	0.822

Flow totals

Total flow raw was 23121.422 ML
Total flow treated was 21184.066 ML
Total waste sludge was 33.690 ML

Minimums

Minimum day treated was 47.077 ML
Minimum flow rate treated was 20.797 ML/day
Total waste sludge minimum was 0.477 ML

Maximums

Maximum day treated was 87.019 ML
Maximum flow rate treated was 112.852 ML/day
Total waste sludge maximum was 7.458 ML

Averages

Total average day raw was 63.314 ML
Total average day treated was 58.008 ML
Total waste sludge average was 2.808 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
January	53.765	24%	58.446	26%	76.287	34%
February	54.637	24%	67.968	30%	83.352	37%
March	53.510	24%	58.275	26%	79.170	35%
April	52.264	23%	54.933	24%	77.088	34%
May	54.540	24%	60.835	27%	80.235	35%
June	65.517	29%	79.881	35%	101.285	45%
July	70.895	31%	80.253	35%	104.406	46%
August	69.405	31%	87.019	38%	112.852	50%
September	61.279	27%	69.675	31%	98.133	43%
October	56.690	25%	62.777	28%	99.855	44%
November	52.036	23%	56.016	25%	77.016	34%
December	51.561	23%	56.565	25%	82.212	36%