2019 Washington Code 70.119.030

2018 Washington Code 70.119.030 – Certified operators required for certain public water systems

2016 Washington Code 70.119.030 – Certified operators required for certain public water systems

2015 Washington Code 70.119.030 – Certified operators required for certain public water systems

2014 Washington Code 70.119.030 – Certified operators required for certain public water systems

2013 Washington Code 70.119.030 – Certified operators required for certain public water systems

2009 Washington Code 70.119.030 – Certified operators required for certain public water systems