Sewer abatement credit program

Industrial, commercial and institutional customers who reduce their wastewater treatment needs may qualify for a credit on their bill, paid once a year. The credit amount is based on annual water and wastewater use measured from January 1 to December 31 of the previous application year.

Note: Those applying for the 2018 sewer abatement credit will need to submit water and wastewater use measured between program start date, July 1, 2018, and year end, December 31, 2018.

At current wastewater rates, a business using 100,000 m3 of water and diverting 25 per cent from the wastewater system would receive a credit of $25,875. View a sample credit calculation.

The credit applies to 75 per cent of the difference between water used in and wastewater sent down the drain. The calculation helps encourage customers to use water wisely and reduce their wastewater treatment needs.

The credit does not apply to:

  • Changes to over strength agreements and associated costs
  • Wastewater volumes from leaks and process malfunctions
  • Water volumes for irrigation or other outdoor water uses
  • Water or wastewater charges prior to 2018. For the calendar year of 2018, the maximum period for which staff may calculate the credit is from July 1, 2018 to December 31, 2018.

How to qualify

Participants must:

  • be located within the Guelph city limits;
  • be connected to City’s water supply and wastewater treatment systems;
  • be an industrial, commercial or institution as defined by the Municipal Property Assessment Corporation; and
  • divert at least 25 per cent of the water purchased from the City away from the wastewater treatment system.
  • submit their application by March 1 of the calendar year. For instance, 2018 applications must be submitted by March 1, 2019.

Wastewater metering requirements

  • Participants in the credit program must report the amount of wastewater diverted from the City’s wastewater treatment system.
  • We recommend purchasing and installing a City-approved AWWA Standard C701 or C702 flow meter at a location determined by the City. If installation of a flow meter is not possible, the participant must conduct flow metering to measure how much water is consumed, and how much is diverted from Guelph’s wastewater treatment system as agreed to by the City.
  • The participant must allow the City safe and timely access to the property for the purposes of administering the credit program, inspecting the site, and confirming the contents of the program application and engineering report.

How to apply

Please submit a completed application form including:

  • contact information;
  • property address;
  • Guelph Hydro/Alectra account number;
  • serial number of each applicable water meter;
  • acknowledgement to meet all applicable requirements of the credit program.

There is a $125/hour assessment fee. Timing of an assessment may vary per customer. The City will provide a quote for the total associated costs of the application review after submission.

Please submit an engineering report that includes:

  • the total volumetric amount of water (in m3) purchased from the City, between January 1 and December 31, as determined from the Guelph Hydro/Alectra invoice;
  • the total volumetric amount of water (in m3) diverted from the City’s wastewater treatment system between January 1 to December 31;
  • a description of the industrial, commercial or institutional processes responsible for water consumption on the property, and the sources (City and non-City) of water supplying those processes;
  • a description of current process metering;
  • electronic production records;
  • a description of each water source and effluent discharge process;
  • a clear explanation of industry-accepted equations and formulae for all calculations; refer to the production records for water captured in production; and
  • specifications and annual calibration records for the water flow meters and data loggers used to capture process information.

Sewer Abatement Credit Application

Please submit the application form, engineering report and all required fees by March 1 to receive a credit for the previous calendar year. A new application must be submitted every calendar year.

The City will review applications within 60 business days and inform applicants if they qualify for the credit program.


Sample sewer abatement credit calculation

If a business used 100,000 m3 of water and was able to divert 25 per cent from the wastewater system they would receive a credit of $25,875.

Annual water bill before credit:

(100,000 m3 x $1.84/m3) = $184,000.
1.84/m3 represents current wastewater rate charged for sewer use discharge (sewer surcharge). This rate is determined by City Council and can be subject to change.

Annual water bill after credit:

  • Water Volume Minus Diversion of 25%
  • Eligible Volume = (100,000 m3 minus 75,000 m3 ) multiplied by 75% = 18,750 m3 . 
    75% of the difference between the water used and discharged is eligible for credit. This encourages water conservation
  • Credit = (18,750 m3 multiplied by 1.84/m3*) minus 25% = $25,875.
    25% of the credit amount is deducted to cover Infiltration and Inflow (INI) costs shared among all City of Guelph water and wastewater customers.

Water and Wastewater Rate Review

Sewer Abatement Credit Policy

Bill exceptions study PowerPoint presentations

For more information

519-822-1260 extension 5629