Total Coliform Rule

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Total Coliform Rule
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What is a Coliform Sampling Plan?
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Types of Coliform Samples

• Routine
• Representative of water that people are drinking
  
• Taken from a site on your coliform sample plan
• Repeat
• Taken after notification of positive routine
  sample
• Special
• Taken for systems own information to verify if
  sample tap is good, from a pipeline after
  construction, etc.
• Not representative of water in entire system
• Does not need to be reported to DWP

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Sampling Techniques

• Sample Location Use a non-swivel faucet, remove
  all attachments aerator, screen, hose, etc.
• Flush the line for 3 to 5 minutes
• Dont open the sample bottle until ready to fill,
  dont touch the inside of the bottle or lid, and
  dont rinse
• Reduce the water flow to a steady stream and
  gently fill bottle, leave an air space of at
  least one-half inch at the top, and replace the
  lid
• Deliver to the lab immediately keep the sample
  refrigerated or on ice if keeping longer than 2
  hours
• Labs cannot process samples older than 30 hours

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If Total Coliforms Are Present

• Call the County or State DWP
• Repeat samples must be collected w/in 24 hrs of
  notification of a positive routine sample
• Number of Repeat samples required
• Systems taking 1 or less routine per month 4
• Systems taking 2 or more routines per month 3

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If Total Coliforms Are Present (cont.)

• Repeat Sample Locations
• One from the original tap
• One within 5 service connections upstream
• One within 5 service connections downstream
• If 4 repeats are required, one from another
  location in the system, preferably at the source

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Repeat Sampling Results

• If all repeat samples are coliform negative,
  problem is resolved
• Just remember at least 5 routine samples must
  be collected during the month following a
  positive sample
• If any of the repeat samples are coliform
  positive, the system violates the total coliform
  MCL - corrective action and public notice is
  required
• (Note The MCL for systems collecting 40 or more
  routine samples per month is 5 of samples
  collected)

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Filling Out the Lab Slip

• Fill out the lab slip completely.
• If we dont recognize the water system name, or
  the water system ID is wrong, the system will
  not receive credit for the test
• Mark the Sample Type routine, repeat or
  special
• For repeat samples, indicate if the repeat was
  collected at the same tap, upstream, downstream
  or other location

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Routine Sampling

• Number of samples and frequency based on system
  type and size

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Coliform Sampling Plan

• Every water system should have a written coliform
  sampling plan, even if your lab collects the
  sample.
• It should include the following basic elements
• A brief description of coliform sampling
  requirements
• A list of routine corresponding repeat sample
  sites
• Rotation schedule of sample collection
• Sample collection procedures
• A distribution map showing locations of water
  sources, storage facilities, and sampling
  locations

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Mothers Day
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Abby Big Pipe
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