Wellhead Protection Program Monitoring:

As part of its Wellhead Protection Program, the City has collected groundwater samples semi-annually from deep sentinel wells surrounding the Mint Farm wellfield to monitor changes in water quality. For a summary report and analytical results for each sampling event, click on the following links:

  • 09-04-2009 Deep Monitoring Wells Construction Well Logs - A detailed record of the geologic formation of deep monitoring wells DW-1 through DW-9 based on visual inspection of the cuttings produced during drilling and physical measurement made by instruments lowered into the hole.
  • 03-01-2013 Monitoring Well Sampling Program - An itemized list of routine DOH test panels and special interest analytes tested for during semi-annual sampling events including recommended testing frequency, EPA test method and estimated laboratory costs. 
  • 02-09-2012 Wellhead Protection Program - The WHPP was developed to protect the groundwater source and comply with WAC 246-290-135 (3). The Department of Health approved the plan in March 2010 and it was incorporated in the City's 2012 Water Master Plan Update.
  • 06-28-2012 Water Supply Protection Ordinance No. 3209 - This ordinance supplements the WHPP to minimize the risk of contamination and provide a means of enforcement, while still allowing economic development which does not pose unreasonable risk to the aquifer. Staff continues to work with Cowlitz and Columbia counties to adopt similar ordinances to protect the groundwater supply.
Last updated: 12/28/2017 3:57:04 PM