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Water and wastewater rates

Water, wastewater, drainage and waste and recycling charges are calculated by the number of days on your ENMAX bill. The number of days billed can vary; however, it is typically 28-30 days of service that appears on your statement.

All rates are set by the Water Utility Bylaw 40M2006, Wastewater Bylaw 14M2012, Drainage Bylaw 37M2005 and Waste Management Bylaw 20M2001.

For answers to common water utility account questions, please see the following pages:

In This Section:

2015-2018 utility rates

The rates listed below are all based on 30-days-of-service, which means the amount on your bill may vary, depending on the number of days you have been billed.

Residential Metered

A residential metered customer is a single or two-family dwelling that has a water meter installed that measures the amount of water used.


2015 2016 2017 2018
Water service charge
($ per 30 days)
$15.80 $15.85 $15.59 $15.33
Water usage rate
($ per cubic metre)
$1.7698 $1.7904 $1.7474 $1.6652
Wastewater service charge*
($ per 30 days)
$20.60 $23.66 $24.72 $25.69
Wastewater usage rate
($ per cubic metre of
water used)
$1.1028 $1.3051 $1.3956 $1.4852
Drainage service charge
($ per 30 days)
$10.96 $13.05 $14.02 $15.05

Please note: All residential metered will be charged the 15 mm charge. All irrigation services will be charged the 20 mm charge.

Learn more about your blue, black and green carts, visit Waste & Recycling Services.

Wastewater return factor


Customer class Return factor
Residential metered 0.90

The wastewater usage rate is calculated as the proportion of water used that is returned to the wastewater collection system. A specific return factor is calculated based on customer class, which is done through consumption analysis as part of the Utility’s Cost of Service Study.

It is calculated by comparing the consumption peak that we see over the summer months, attributable to outdoor water use, to the overall, annual water use for a given customer class.

In looking at the residential customer class’ water use, the outdoor use is equivalent to 10% of the overall, annual water use; therefore, on average, 90% of water used by the single family residential customer class is returned to the wastewater collection system.

Residential Flat Rate

A residential flat rate customer is a single or two-family dwelling that does not have a water meter installed to measure the amount of water used. Learn more about water meters and how you can get one installed.


2015 2016 2017 2018
$ per thousand square feet
of actual lot area
$6.0039 $6.1240 $6.1240 $6.1240
$ per thousand square feet
of gross building area
$18.7233 $19.0978 $19.0978 $19.0978
Drainage service charge
($ per 30 days)
$10.96 $13.05 $14.02 $15.05

Minimum monthly rates: If the total water charge for a flat rate customer falls below the minimum monthly water rate, the customer will be charged the minimum rate. For 2016-2018, that amount is $46.17. In this situation, the wastewater charge would also be determined using the minimum monthly rate.

Below is an example calculation for a flat rate customer:

A 5,000 square foot lot, the calculation is 5 x $6.12 = $30.60

PLUS

2,000 square feet of total building space, the calculation is 2 x $19.10 = $38.20

PLUS

*144.46% of ($30.60+$38.20) = 144.46% of $68.80 = $99.39 wastewater charge

Wastewater return factor


2015 2016 2017 2018
Percentage of water charge
for flat rate customers​
82.53%​ 103.31% 121.91​% 144.46%

Multi-family

A multi-family customer as defined by Part 1 in theWater Utility Bylaw 40M2006 is any collection of dwelling units that are greater than two units that are physically attached or site with a collection of dwelling units.


2015 2016 2017 2018
Water service charge
($ per 30 days)
$15.80 $15.85 $15.59 $15.33
Water usage rate
($ per cubic metre)
$1.6107 $1.6214 $1.6143 $1.6098
Wastewater service charge
($ per 30 days)
$20.60 $23.66 $24.72 $25.69
Wastewater usage rate
($ per cubic metre of water used)
$1.2969 $1.4926 $1.5714 $1.6636
Drainage service charge
($ per 30 days)
$10.96 $13.05 $14.02 $15.05

Wastewater return factor


Customer class Return factor
Multi-family residential metered 0.97

General Service

A general service customer is defined by section 10 in the Water Utility Bylaw 40M2006.

This customer group is charged a basic monthly service charge based on the size of water meter.


Service charge according
to water meter size
($ per 30 days)

Various meter sizes

2015

2016

2017

2018

General service regular = less than 75 mm

20 mm**

$22.15

$26.98

$28.02

$30.44

25 mm

$28.28

$32.95

$34.22

$37.17

40 mm

$46.01

$56.39

$58.57

$63.63

50 mm

$71.59

$76.78

$79.75

$86.63

General service large = equal to or greater than 75 mm

75 mm

$89.28

$121.37

$159.95

$173.76

100 mm

$109.27

$161.39

$223.34

$242.62

150 mm

$149.20

$252.47

$373.90

$406.18

200 mm

$283.25

$428.77

$601.34

$653.25

250 mm

$630.05

$783.73

$972.54

$1,056.48

Wastewater service charge
($ per 30 days)

$20.60

$23.66

$24.72

$25.69

Wastewater usage rate
($ per cubic metre of water used)

$1.2283

$1.4116

$1.4776

$1.5552

Drainage service charge
($ per 30 days)

$10.96

$13.05

$14.02

$15.05

Usage rates for general service customers inside city limits


Based on size of meter
($/cubic metre)
2015 2016 2017 2018
Less than 75 mm $1.3516 $1.3655 $1.3898 $1.4099
Equal to or greater than
75 mm
$0.9968 $1.0425 $1.1195 $1.2977

Wastewater return factor


Customer class Return factor
General Service metered 0.90

Irrigation Services


2015 2016 2017 2018
Irrigation Services
($ per cubic metre)
$2.8886 $2.7402 $2.6803 $2.5911

Learn more about irrigation and water management.

Wastewater surcharge rates

The City of Calgary Water Utility operates on a cost recovery model, which is a surcharge program to recover the costs associated with treating higher strength wastewater. The costs are the responsibility of those contributing to it. The rates or charges described below are shown for the years 2015 to 2018, and must apply in the calendar year indicated (from January 1 to December 31, inclusive).

Monthly rates or charges described in this section are based on a 30 day period. The amount billed must be established by dividing the applicable monthly rate or charge by 30 to derive a daily rate and then multiplying the daily rate by the actual number of days in the billing period.

To learn more about the formulas, charges and how they are calculated, visit Wastewater Bylaw 14M2012 and refer to Schedule F.

Sewer (wastewater) service surcharge program

The sewer service surcharge is billed in addition to regular sewer service charges when our laboratory tests show that a business is releasing over-strength wastewater into the sewer system.

To learn more about the charge and how it is calculated, visit Sewer Service Surcharge

Effluent meter customers

In addition to any charge in the above table, a charge equal to the service charge and the usage rate according to the following table for the equivalent amount of water with which the property is served from other sources.


2015 2016 2017 2018
Service Charge ($ per 30 days) $20.60 $23.66 $24.72 $25.69
Usage rate
($ per cubic metre of wastewater released into
The City's wastewater system)
$1.3648 $1.5685 $1.6417 $1.7281

Learn more about Effluent Meters.

Hauled wastewater and septage

Customers that have a permit to dispose of hauled wastewater and septage into a public disposal station need to apply for an account allowing them to dispose hauled wastewater and septage to those depots. The customer may pay a fee of $25.00 for each access card (fee refundable on return of card), in addition to payment of a service charge and volume charges, as described below.


2015 2016 2017 2018
Service Charge
($ per 30 days)
$20.60 $23.66 $24.72 $25.69
Volume Charge
($ per cubic metre)
$17.5818 $20.3597 $21.3913 $22.4483

Learn more about the hauled wast​ewater and septage, visit Wastewater Disposal Permits.

Bulk water

Learn more about bulk water, visit the bulk water page.​​