Guidance on Controlling Corrosion in Drinking Water Distribution Systems

Background on guidance documents
Part A. Guidance on corrosion control
A.1 Introduction and background
A.2 Corrosion control programs and protocols
- A.2.1 Monitoring program for residential sites: option 1 (two-tier protocol)
- A.2.2 Monitoring program for residential sites: option 2 (lead service line residences)
  - A.2.2.1 Sampling protocol
- A.2.3 Frequency of sampling for residential monitoring
- A.2.4 Number and selection of sites for residential monitoring
- A.2.5 Monitoring program for non-residential sites (two-tier protocol)
A.3 Responsabilites
A.4 Sampling protocols and action levels for lead
- A.4.1 Initial monitoring for residential sites: option 1 (two-tier protocol)
- A.4.2 Initial monitoring for residential sites: option 2 (lead service line residences)
- A.4.3 Initial monitoring for non-residential sites (two-tier protocol)
Part B. Supporting information
B.1 Principles of corrosion in drinking water distribution systems
- B.1.1 Main contaminants from corrosion of drinking water distribution systems
- B.1.2 Sources of contaminants in distribution systems
B.2 Challenges in measuring corrosion
- B.2.1 Levels of contaminants at the tap
- B.2.2 Factors influencing levels of contaminants at the tap
B.3 Methods for measuring corrosion
- B.3.1 Corrosion indices
- B.3.2 Coupons and pipe rig systems
- B.3.3 Lead monitoring at the tap
B.4 Treatment/control measures for lead, copper and iron
- B.4.1 Materials in drinking water distribution systems
- B.4.2 Controlling pH and alkalinity
- B.4.3 Corrosion inhibitors
  - B.4.3.1 Phosphate-based inhibitors
  - B.4.3.2 Silicate-based inhibitors
- B.4.4 Flushing and maintenance
- B.4.5 Drinking water treatment devices
B.5 Rationale for monitoring programs for assessing corrosion
- B.5.1 Residential monitoring programs
- B.5.2 Determination of sampling protocols and action level for residential monitoring program: option 1 (two-tier protocol)
  - B.5.2.1 Tier 1 sampling protocol
  - B.5.2.2 Tier 2 sampling protocol
- B.5.3 Determination of sampling protocols and action levels for residential monitoring program: option 2 (lead service line residences)
  - B.5.3.1 Limitations
- B.5.4 Determination of residential monitoring sites
- B.5.5 Determination of sampling protocols and action levels for non-residential monitoring programs
  - B.5.5.1 Tier 1 sampling protocol
  - B.5.5.2 Tier 2 sampling protocol
- B.5.6 Determination of non-residential monitoring sites
Part C. Acronyms, tables and references
C.1 Acronyms
C.2 Guidance on determination of 90th percentile
C.3 Principal factors influencing the corrosion and leaching of lead, copper, iron and cement
C.4 Conditions favouring lead leaching and indicators of lead leaching in drinking water distribution and plumbing systems
- C.4.1 At the treatment plant
- C.4.2 Within the distribution system
- C.4.3 Within the plumbing system
- C.4.4 At the tap
C.5 Guidance on prioritizing residential monitoring sites
C.6 Plumbing profile determination
C.7 References

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Organization: Health Canada

Type: Guidance

Date published: 2009-06

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Guidance on Controlling Corrosion in Drinking Water Distribution Systems

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