Biosolids Beneficial Use program
The City of Ottawa is dedicated to being amongst Canada’s leaders in municipal biosolids management. Ottawa continually monitors research and new technology, follows the most stringent and proactive Best Management Practices and works to share information and build understanding.
The City of Ottawa Biosolids program is guided by the principles of the International Organisation for Standardization (ISO) No‘s 9001, 14001, and 18001, and is governed by Ontario Ministry of Agriculture and Food (OMAF), the Environmental Protection Act and the Nutrient Management Act. It is also governed by the City's own policies and protocols.
The primary outlet of the Biosolids Beneficial Use program is agricultural land application given the large agricultural land base surrounding Ottawa. This program is a major benefit to farmers as biosolids are provided free to farmers and the benefits last for several years.
What are the benefits of the program?
The City of Ottawa strives to beneficially reuse 100% of its biosolids. The benefits include:
- Provides a nutrient rich soil conditioner that improves soil quality
- Facilitates plant growth
- Adds phosphorous to Ottawa area soils that are commonly phosphorous deficient
- Supports the three Rs program: reduce, reuse, recycle!
- Uses a renewable resource
- Increases crop yields and revenues for farmers
- Reduces the need for farmers to purchase expensive fertilizers every year as biosolid application can benefit soil conditions for up to 5 years
- Extends the life of our landfills – saving space and money
- Supports local farming operations
- Supports the agricultural community as an integral part of Ottawa’s identity
How does the program protect my health and the environment?
The City of Ottawa’s Biosolids Beneficial Use program Best Management Practices (BMPs) were developed based on the review of the literature, information gathered from interviews, and experience in the field.
The BMPs are a series of procedures designed to manage the Program in a manner that is consistent, transparent, and verifiable, and in excess of the Ontario Nutrient Management Act (2002) and Ontario Regulation 267/03.
The Beneficial Use program is supported by the City of Ottawa's Sewer Use Program, which restricts what materials are permitted into the wastewater treatment plant and ensures that only treatable, non-hazardous substances enter the system and subsequently the biosolids.
Below is an abstract of the City’s best practices. The City’s BMPs are never less stringent than regulatory requirements. You can also view the complete City of Ottawa Biosolids Beneficial Use Program BMPs.
Abstract of City's biosolids best management practices (BMPs)
||Regulation (O. Reg 267/03)
||City of Ottawa’s Best Management Practice
||Residential areas, commercial, community or institutional uses: No application is permitted within 200m.
||Sites under consideration are a minimum of 450m from any residential areas, commercial, community or institutional uses.
|Land use restrictions
Pre-grazing waiting periods:
- Horses, beef or dairy cattle; 2 months
- Swine, sheep or goats; 6 months
|Land will not be used as pastureland for a minimum period of 5 years following land application.
||The Ministry of Environment and Climate Change, the Ward Councillor, and residents within 450m of the spreading site are notified no less than 2 weeks prior to spreading.
||The City of Ottawa has established a well sampling program for wells located on adjacent lots to land application sites. Wells are tested per request for indicator bacteria, nutrients and metals within 4 weeks of land application of biosolids. Wells are re-tested between 8 and 10 weeks after land application.
||All sites spread during one season are inspected, before, after, or during spreading, by trained City staff for conformance with the Certificate of Approval/Environmental Compliance Approval requirements and the City’s of Ottawa's Best Management Practices.
How were biosolids used in 2016?
100% of Ottawa’s biosolids were re-used in 2016, as described in the following table.
||Quantity (metric tonnes)
||Percentage of total
|Total biosolids produced
|Total directly applied to agricultural land
|Total processed to agricultural soil products
|Total processed to commercial liquid fertilizer
|Total remaining to storage at year end for use in 2017
Leadership in biosolids management
Leading by example: Award winning program
In 2012 the City of Ottawa was proud to win an award from the Water Environment Association of Ontario (WEAO) for “Excellence in Biosolids Management.” The City’s leadership in biosolids management is the result of two decades of work developing an exemplary program through implementing stringent and proactive best management practices (BMPs) and an Environmental Quality Management System (EQMS).
City staff are active contributing members on numerous provincial and technical committees involving biosolids and stay current on issues and subjects important to overall biosolids management. A few of these include:
- Biosolids and Residuals Committee member of the Water Environment Association of Ontario (WEAO)
- Biosolids Committee member of the Canadian Waste Water Association (CWWA)
- International Standards Organization (ISO) Technical Committee 275, Sludge recovery, recycling, treatment and disposal: Land Application Working Group 4
Resources on biosolids
If you have comments or questions regarding the City of Ottawa’s Biosolids Beneficial Use Program or would like to have biosolids applied to your farm land, please contact the City of Ottawa by telephone at 613-580-2424 ext. 23257, or by email at firstname.lastname@example.org.
Ontario Ministry of Agriculture and Food
For more information on provincial regulations regarding biosolids management, land application, storage, permits or plans please contact the Ontario Ministry of Agriculture and Food (OMAF) by telephone at the Nutrient Management Information Line, 1-866-242-4460, or by email at email@example.com.
Ontario Ministry of the Environment
For biosolids environmental incidents, spills, or legislative requirements, contact the Ontario Ministry of the Environment and Climate Change by telephone at 1-800-565-4923.
City of Ottawa biosolids are tested every two weeks by a third-party accredited laboratory for metals, pathogens and nutrients, as well as additional testing beyond regulatory requirements. The tests consistently demonstrate that both the metal and pathogen levels of the City’s biosolids are well below regulated levels. Based on the Ontario Regulation 267/03 of the Nutrient Management Act, 2002(link is external), the City’s biosolids are Category 3 biosolids suitable for agricultural land application.
The four most recent biosolids laboratory results are published regularly. Note that all the listed parameters are well below the provincial standards.
Biosolids: Frequently asked questions
What are biosolids?
Biosolids are a product of sewage treatment that can be used as a natural fertilizer as well as a conditioner to recover contaminated or unusable soil.
As sewage moves through Ottawa’s wastewater treatment facility, solids are extracted from liquids for further treatment. These solids are then dewatered to produce a dry, dark, nutrient-rich material called biosolid cake that closely resembles damp organic soil.
Ottawa biosolids are rich in essential nutrients for plant growth, such as phosphorous. Ottawa-area soils are naturally deficient in phosphorous and the application of biosolids helps return this essential nutrient to the soil.
Who benefits from the use of biosolids?
- The City of Ottawa supplies, delivers and applies biosolids free of charge to eligible farms. This is a significant cost savings for farmers who would otherwise need to purchase commercial fertilizers.
- If you are a farmer interested in participating in the City of Ottawa's Biosolids Beneficial Use Program, please contact 613-580-2424, ext. 23257, or send an email to firstname.lastname@example.org.
- The re-use of biosolids keeps close to 50,000 metric tonnes of biosolids out of landfills every year. This extends the life of the City landfill and is more cost-effective than other disposal methods such as incineration.
How are biosolids typically used?
As a fertilizer:
- Ottawa biosolids are an excellent soil amendment providing a significant source of nutrients essential for plant growth such as phosphorus, nitrogen, calcium and other micro-elements. Using biosolids as a soil amendment on farm land is an effective and efficient way to increase the productivity of local soils.
For land reclamation:
- Biosolids can be applied to remediation sites where the material improves soil structure, provides organics and nutrients needed for plant re-growth and helps with water retention.
Do biosolids contain metals?
Yes. However, the levels are closely monitored and are well below provincial regulation limits. Also, under the Nutrient Management Act, the City is required to monitor and report to the Ontario Ministry of Agriculture, Food & Rural Affairs (OMAFRA). Some metals such as copper are considered essential trace elements for plant growth.
The City of Ottawa operates a variety of programs to minimize contaminants entering the wastewater stream, including:
Is land application of biosolids a common practice?
Land application of biosolids is a common and acceptable practice for many North American municipalities. Ottawa has had a biosolid land application program since 1992.
What kinds of crops are fertilized with biosolids?
Ottawa’s biosolids are typically used to fertilize crops that are used for fuel or undergo further processing prior to animal consumption, such as:
- field corn
- cereal crops (e.g. wheat)
- legumes (e.g. alfalfa and soybeans)
How often can biosolids be applied to farmland and how much?
The frequency of land applications varies from site to site. Several factors are considered when determining a suitable site for land application. Some of the factors include: proximity to residential areas, slope of the land, soil chemistry, drainage, crops to be grown, and nearby watercourses. Ontario Regulation 267/03 restricts the volume of biosolids that can be applied to a field to protect both surface water and ground water in Ontario.
Do biosolids have an odour?
Yes, and the City employs the following best management practices to minimize odour during land application:
- Biosolids must be incorporated into the soil within 2 hours of their application
- Stockpiling of biosolids in fields is not permitted
- Local residents within 450m of the spreading location are notified a few weeks before the biosolids are applied
- Biosolids are not spread on weekends or statutory holidays
What does the City do to assess my water quality?
As per the City of Ottawa’s best management practices, the City offers free well water testing upon request to households adjacent to biosolid application sites. Tests will be taken up to four weeks before biosolids are applied, and between 10 and 12 weeks after application. All well test results are provided to the well owner.
Interested residents may book free well testing by calling 1-877-360-3830 or 613-260-3830. Residents may also request testing through email at email@example.com.
Ottawa Public Health provides free well testing to all well owners.
Why does the City apply biosolids instead of putting them in a landfill?
Land application is currently the most sustainable and cost-effective reuse option for the City of Ottawa’s biosolids. In addition, land application takes best advantage of a fixed and limited resource – phosphorus – which is essential for plant growth. Land application of biosolids redirects 50,000 metric tonnes towards beneficial reuse of material and puts valuable nutrients back into the soil.