Water Quality Report
Read the 2025 Annual Water Quality Report.
The Township of Langley 2025 Annual Water Quality Report is required under the British Columbia Drinking Water Protection Regulation. The annual report summarizes the analysis of over 1,500 water quality samples that were collected from the Townships' source and water distribution systems and analyzed by accredited water testing labs.
The Township’s water is primarily sourced from the Greater Vancouver Water District (GVWD) and augmented by eight groundwater wells servicing Aldergrove and Acadia. A staff of 62 maintain approximately 605 km of water main from source to service connection, including flushing, reservoir cleaning and inspection programs. Field staff hold a variety of Environmental Operator Certification Program (EOCP) certifications and are supported by several professional and technical personnel. There are an additional three independent groundwater wells that individually service Brown, Ponder, and Williams Park that are not connected to the Municipal water system.
The Township of Langley continued to uphold its commitment to delivering safe, high-quality drinking water to approximately 135,000 residents in 2025. The Township’s drinking water met the requirements of the DWPR and the Health Canada Guidelines for Drinking Water Quality (GCDWQ). Over 1,500 water samples were collected in 2025, of which 11 samples tested positive for total coliforms and were swiftly addressed. Groundwater in Aldergrove continues to contain elevated levels of iron, manganese, and nitrates; however, after blending, filtration, and treatment at the Aldergrove Water Treatment Plant (AWTP), the treated water falls within GCDWQ requirements. A new rechlorination station was installed at the Brawn Pump Station in 2025 to improve chlorine residual levels in Gloucester, Aldergrove, and Murrayville.
Challenges due to aging infrastructure and changing flow patterns continue to be addressed with ongoing replacement strategies, regular maintenance, and increased standards for the construction of new water infrastructure.
The Township’s multi-barrier approach encompasses source protection, treatment, and distribution maintenance to ensure that drinking water remains safe and reliable.
The 2025 results confirm that the Township’s water is potable and compliant with all regulatory standards, with continuous improvements planned to meet future demands.
Read other Utilities water quality reports (2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014) and Parks water quality reports (2023, 2022, 2021, 2020, 2019, 2018, 2016, 2015).
Cross Connection Control Program
A cross connection is any physical connection between a possible source of contamination and any drinking water piping. Backflow is the flow of water in the reverse direction within a piping system. When a cross connection and backflow are combined, the result can be a contaminant entering the water supply piping.
The Township’s Cross Connection Control Program is pro-active and safeguards our drinking water from actual or potential cross connections by tracking backflow preventers, building a strong backflow industry network, incorporating backflow prevention at the design stage of new construction, and promoting safe drinking water practices.
Backflow prevention Backflow device test report
Township contacts
Test reports for new installations or as part of final inspection of the building:
| Building Department |
|---|
|
604-533-6018 |
Annual retesting, repairs, test reports, technical or program inquiries:
| Engineering Division |
|---|
| 604-532-7300 backflow@tol.ca |
Frequently asked questions
| Why am I required to test my backflow preventer (DCVA or RPBA) annually? |
| Ensuring safe drinking water is important to health and safety. Annually, a Certified Backflow Preventer Tester performs a test which ensures the check valves close and do not allow any contaminated water to seep through them should water flow backwards. Just like any seal, the check valve seal can wear over time and allow contaminated water to flow into the drinking water system. |
| Who tests backflow preventers? |
| A BC Water and Waste Association Certified Backflow Preventer Tester with a valid Township Business License. The Township rejects test reports from Testers with either a lapsed tester’s certification or Business License. A test tag attached to your backflow preventer may have Tester contact information. |
| What is the difference between a Double Check Valve Assembly (DCVA) and a Reduced Pressure Backflow Assembly (RPBA)? |
|
DCVAs are installed to protect against low or moderate hazards where a contaminant or pollutant will be more of a nuisance or aesthetically objectionable. RPBAs are installed to protect against a high risk or probability of a pollutant backflowing into your drinking water at home or at work. At the bottom of the RPBA is a relief valve port which provides a visual sign of a backflow problem by discharging potentially toxic water to the floor drain rather than into the drinking water system. Constant water discharge is a sign to call your plumber. |
| Where are Township Test Reports located? |
| Township Test Reports can be found here. |
| Where do I send test reports? |
|
For new backflow preventer installations and as part of final inspection of a building, email Test Report forms to the Building Department at permitsec@tol.ca Forms may also be mailed to the Civic Facility. For annual retesting Test Reports, email forms to backflow@tol.ca with the facility address in the subject line. Forms may also be mailed to the Operations Centre. |
| Why do I send failed test reports to the Township? |
| The Township tracks all test reports, passed and failed. By submitting failed Backflow Preventer Test Reports, the Township’s database is current in case of a backflow incident. Furthermore, the Facility Owner will not receive Overdue Notices but rather Repair Notices. |
| Do I need a plumbing permit to install a backflow preventer? |
| Plumbing permits are required for the installation of all new testable backflow preventers and can be obtained from the Civic Facility, Building Department. Permits are required when installing or altering any equipment and are required prior to starting any work. Plumbing permits are not required for regular testing and maintenance of backflow preventers. |
| Who do I contact regarding annual and overdue test reports, or repairs? |
| Call 604-532-7300 or email backflow@tol.ca. |
| Who do I contact regarding new installations or other technical inquiries? |
| Call 604-532-7300 or email backflow@tol.ca for technical inquiries such as new installations, CSA B64 - selection and installation of backflow preventers, or Water Works Bylaw No. 6074 interpretations. |