Water Sampling Procedure for Fixed Premises


Category: Safe Water
Subject: Water Sampling Procedure for Fixed Premises
Division: N/A
Policy Number: CA.83.01.111
Effective Date: March 1996


It is the policy of the Wellington-Dufferin-Guelph Public Health to sample drinking water from all wells that are used in establishments that serve the public according to the Ontario Drinking Water Standards to ensure that the potability of public supplies is maintained.


Rob Thompson  


Category: Safe Water
Subject: Water Sampling Procedure for Fixed Premises
Division: N/A
Procedure Number: CA.83.02.111
Effective Date: March 1996


  1. Public Health Inspectors (PHIs) shall take one sample per visit of all fixed premises drawing drinking water from a non-municipal source in their areas.  If the system is chlorinated, chlorine residual shall be taken from the point of sampling and recorded on the appropriate water submission form.
  2. The water samples are to be taken in accordance with The Ontario Drinking Water Standards.  The locations from which the water sample is to be taken must be representative of the supply.  If a water treatment device such as a carbon filter is attached to the faucet, choose another location.
  3. The frequency of sampling shall be a minimum of 1 time per year for low-risk premises, 2 times per year for all medium fixed premises and 3 times per year for high-risk premises.
  4. The Ontario Ministry of Health and Long-Term Care Bacteriological Analysis of Water form shall be fully completed.
  5. Accurate records are to be kept on file outlining the following:
  • Name and address of water works and SDWS #;
  • Name, address, telephone and fax of water works owner;
  • Drinking water source (ground or surface);
  • Treatment devices attached to water works (filters, softeners, UV);
  • Well type, age, and depth;
  • Number of wells;
  • Which wells service what areas;
  • Location of sampling points; and
  • Well location.
  1. Once the reports are returned from the lab with no adverse readings, mail the original to the owner/operator and file the copy.
  2. If an adverse result is received, verbally notify the owner.  Re-sample at the following locations:
  • Original site (kitchen or where water is used for drinking); and
  • From the point where the water enters the plumbing system after the holding tank and before any form of treatment or disinfection devise.

If both samples are adverse, issue a Boil Water Advisory (HPD SW (L)2). If the original sample site is adverse but the second sample is clear, remediation of the plumbing system may be required.

  1. Repeated adverse samples or a history of adverse bacteriological results will warrant the issuance of an order to the owner to install a water disinfection treatment device to render the water supply potable.


Rob Thompson