Water Quality Update – July 24, 2025

July 24, 2025

CITY OF MATTOON

WATER QUALITY UPDATE – July 24, 2025

Current Sample

Sample collected on July 24th showed non-detectable levels of harmful algal bloom neurological toxin in the drinking water at 0.038 ppb which is considered non-detect under the EPA recommended advisory levels of .30 ppb.

We will continue to sample per-EPA guidelines.

Past Samples

  • Samples collected on July 16th showed harmful algal bloom neurological toxin in the drinking water at .215 ppb which is under the EPA recommended advisory levels of .30 ppb.
  • Samples collected on July 17th showed harmful algal bloom neurological toxin in the drinking water at .058 ppb which is considered non-detect under the EPA recommended advisory levels of .30 ppb.
  • Samples collected on July 18th showed harmful algal bloom neurological toxin in the drinking water at .10 ppb which is considered non-detect under the EPA recommended advisory levels of .30 ppb.
  • Sample collected on July 21st showed non-detectable levels of harmful algal bloom neurological toxin in the drinking water at 0.14 ppb which is considered non-detect under the EPA recommended advisory levels of .30 ppb.

The next sample date as recommended by the IEPA will be taken next Monday, July 28th. The City will issue a formal update when we have the results from that sample.

WHAT ACTIONS HAS THE CITY OF MATTOON TAKEN TO CORRECT THE PROBLEM?

  • Contracted with a consultant who recommended both short-term and long-term solutions.
  • Increased the Powder-Activated Carbon (PAC).
  • Increased chlorine feed rates.
  • Performed directional flushing of distribution system based on IEPA recommendations.
  • Developing long-term treatment options, including lake and plant treatment.