Government of Nova Scotia Government of Nova Scotia Nova Scotia, Canada


Drinking Water

Municipal Water Approvals Protocols

The Province of Nova Scotia has a comprehensive Drinking Water StrategyPDF Download Link (PDF:1.2mb). The success of the strategy rests on the ability of all stakeholders to work together effectively in the delivery of safe, clean drinking water for all Nova Scotians.

Nova Scotia Environment is responsible for issuing approvals for the construction and operation of water treatment and distribution facilities. In order to obtain an approval, a completed application form and supporting documentation must be submitted to NSE.

In March 2012, Nova Scotia Environment updated its municipal water approvals protocols. Active municipal water systems are required to complete a System Assessment Report by April 1, 2013 to verify that each system is technically capable of achieving current environmental standards.

System Assessment Report and Terms of Reference

The purpose of a System Assessment Report is to verify that municipal drinking water systems meet:

  • current environmental standards, which are frequently updated and enhanced for public health protection;
  • the minimum requirements set out in the Nova Scotia Treatment Standards for Municipal Drinking Water Systems, as amended from time to time.

A clear Terms of ReferencePDF Download Link (PDF:277k) document has been prepared to assist owners of municipal water systems prepare these reports by April 1, 2013.

Microscopic Particulate Analysis

Approved ModificationsPDF Download Link (PDF:174k)

Treatment Standards

The Nova Scotia Treatment Standards for Municipal Drinking Water Systems outline the requirements for municipal drinking water systems that use surface water, groundwater under the direct influence of surface water (GUDI), secure groundwater (non-GUDI), or purchase water from an adjoining municipality. GUDI supplies are impacted or susceptible to contamination by surface water and therefore must be treated as a surface water source.

The Treatment Standards document is available below as one large document (100 pages) or in twelve sections.

The complete document is available herePDF Download Link (PDF:793k)

Part I to V of the Treatment StandardsPDF Download Link (PDF:241k) sets out the minimum requirements that apply to municipal drinking water systems in Nova Scotia. This includes source water protection, adequate treatment and distribution, operations and management.

Appendix A - GUDI ProtocolPDF Download Link (PDF:141k) outlines the process to be used to identify whether groundwater supplies are under the direct influence of surface water (GUDI).

Appendix B - Natural Filtration GuidelinesPDF Download Link (PDF:70k) outlines the criteria for determining which groundwater supplies that are under the direct influence of surface water (GUDI) may be assigned a log removal credit for the natural filtration capacity of the aquifer. GUDI supplies that are assigned a log removal credit may apply the credit towards meeting the requirements of the Treatment Standard.

Appendix C - Technical Considerations for Filtration and DisinfectionPDF Download Link (PDF:94k) outlines specific requirements that apply for ultraviolet (UV) light disinfection, on-site generation of sodium hypochlorite, and membrane filtration.

Appendix D - Log Inactivation Information and TablesPDF Download Link (PDF:166k) provides log inactivation values for free chlorine, chlorine dioxide, ozone and UV disinfection.

Appendix E - Baffling FactorsPDF Download Link (PDF:280k) provides baffling factors for sample contact chamber designs.

Appendix F - Sample CT CalculationPDF Download Link (PDF:93k) provides guidance regarding how to calculate CT.

Appendix G - Reporting RequirementsPDF Download Link (PDF:61k) summarizes the reporting requirements that apply to municipal drinking water systems.

Concluding Remarks

The Municipal Water Approvals Protocols enable stakeholders to meet their individual and collective responsibilities in the delivery of safe, clean drinking water. The process provides accountability and confidence in the drinking water systems in Nova Scotia.