What does this “Action Level” exceedance and advisory mean?

The City of St. Clair Shores has 25,303 water customers. The City estimates that there are approximately 650 homes with lead service lines. In St. Clair Shores lead service lines are most commonly found in homes built between 1920 and 1950.

32 of those customers with known lead service lines were tested during September 2019. 4 of the 32 locations tested exceeded the 15 parts-per-billion (ppb) “Action Level” threshold, triggering the current Public Advisory. The city’s 90th percentile value for lead concentrations among sites tested was 21 ppb. The testing results shown that the “Action Level” exceedances were from samples taken from the lead water service lines.

Per the Lead and Copper Rule of the Michigan Safe Drinking Water Act, the city is required to periodically sample a number of water taps throughout its system for lead concentration levels. In 2018, the sampling protocol for this routine sampling changed to require multiple samples at each sample location and to exclusively target locations served by lead water service lines. The intention of this change was to better detect lead.

According to the rule, if approximately 10% of sites sampled (90th percentile) indicate lead concentrations of 15 ppb or greater, the city is required to:

  • advise water customers of the results
    provide tips on how to reduce lead exposure
    increase community-wide sampling


Show All Answers

1. What does this “Action Level” exceedance and advisory mean?
2. How does lead get into drinking water?
3. How can I protect myself from lead in water?
4. Is there a simple way to see if I have lead service line in my home?
5. What are the health effects from lead exposure?
6. What is the City doing about this issue?
7. How do I get a drinking water filter?
8. Where can I get my water tested?
9. What educational resources are available?
10. Where can I get information to better understand drinking water filters?
11. Can you explain how to use a faucet filter that is certified to reduce lead in drinking water?
12. I've heard my drinking water faucet has an aerator. What is it?
13. Can my home be part of the community-wide sampling plan?
14. Who do I contact for more information about lead in drinking water?
15. Who can I call to report a water or sewer emergency after the DPW is closed?
16. How does a water main break affect my water?
17. What should I do if water is coming up from the floor drains in my basement?
18. Who is responsible for the water service line and sewer service line to my house?