Treatment options: small drinking water systems

The type and quality of source water used and the design of your drinking water system determines the treatment required

There are many ways to treat source water in your small drinking water system. Only choose products which are certified and meet industry standards.

Types of source water

In Ontario, most small drinking water system operators get their water from two sources: groundwater or surface water. The type and quality of source water used, and the design of your system, usually determines the treatment required.

Secure groundwater

Treatment may not be required for water that is obtained from a secure, well-constructed and maintained groundwater source, such as a drilled well.

Non-secure groundwater

Treatment is required if the source water supplying your small drinking water system is a non-secure groundwater source. If the construction or design of your well allows contamination by surface water, then you may be required to provide filtration and disinfection to the well water.

Surface water

Treatment must be provided if the source water supplying your small drinking water system is from a surface water source. For surface water, you will be required to provide mechanical or chemical-assisted filtration and primary disinfection.

If your system has a distribution system, you may be required to provide secondary disinfection.

What treatment device would work best for your small drinking water system?

There are two types of drinking water treatment devices available: disinfecting devices that are used to deactivate or remove harmful micro-organisms, and water conditioning devices that are used to control or remove chemical, taste and odour problems.

Before you choose a device, it is important to have your water tested and speak with a water treatment specialist. You can also speak with a public health inspector from Public Health Sudbury & Districts by phoning 705.522.9200 or calling toll-free at 1.866.522.9200. Look for a device that has been certified by an accredited body. They provide standards that have been designed to safeguard drinking water by helping to ensure the material safety and performance of products that come into contact with drinking water.

The two main processes used in treating your small drinking water system supply are filtration and disinfection.

Filtration

Disinfection

Depending on where the treatment is installed in your small drinking water system, it may be considered a point-of-entry treatment system or a point-of-use treatment system.

Point-of-entry treatment system

Point-of-use treatment system

Disinfection units and chemicals

Ultraviolet (UV) Light

Chlorinators

Ozonators

Treatment devices for chemical, taste and odour removal

The appearance, taste and smell of drinking water are usually more obvious to the consumer than the bacterial quality. Chemicals such as iron, manganese, sulphide and calcium hardness can cause odour and taste problems.

There are several devices available to remedy these problems; however, these units deal mainly with poor odour and taste problems and do not provide disinfection. If not used correctly, they may even increase existing problems with bacterial contamination.

 Activated carbon or charcoal filters

 Reverse osmosis

Water softener

Get advice from a water treatment specialist to choose the best ways to make your drinking water safe.

For the best treatment, buy only devices that have been certified and meet industry standards.


This item was last modified on April 30, 2024