Revised Total Coliform Rule (RTCR)

Fact Sheet

• Quick Reference Guide

Forms

• Lab Slip with Sampling Instructions

FAQ

• When should I take my RTCR sample?
  • Samples should be taken early in the week and early in the month to leave time if extra or replacement sampling needs to be done.
  • If your system is over 4900 people (> 5 samples/month), samples cannot all be taken on the same day. They need to be spaced out throughout the month.
• Where should I take my RTCR sample?
  • Samples need to be taken from the RTCR Sample Site plan that was submitted to the Drinking Water Program.
  • Take the sample from a sample tap that is inside and a clean sink. There should be separate cold and hot water handles. If only a swivel tap, do NOT move the tap during sampling. Follow the sampling directions on the back of the Sample Information Sheet.
  • Rotate through your sample site plan on a regular basis.
  • Let the Drinking Water Program know if you need to make a change to your sample site plan.
• Mailing samples to the lab.
  • Check with your post office as to the mailing route after it leaves your community. There are certified labs located in Bismarck, Dickinson, Fargo, Grand Forks, Minot, Watford City, and Williston. Use the lab that your sample will make it to within the required 30 hours after collection.
  • Let the Drinking Water Program know if you are changing labs.
• I got a positive routine sample, now what do I do?
  • 3 repeat samples are required to be taken within 10 days of the initial positive.
    • 1-at the original site
    • 1-upstream within 5 service connections
    • 1-downstream within 5 service connections
  • If your system is a groundwater system, you will also have to take a Triggered Source Sample at the well(s) that were in service during the time the routine sample was taken. A sample from the Common Header is also acceptable.

Links

• RTCR Assessments/Site Plans/Start-up Procedures Page

Lists