There are many places with information about drinking water and the related laws and regulations. Here are some links to web sites relevant to Gran Mutual Water Company. Gran Mutual Water Company is in Butte County.
The Butte County link to the left has information about well water. Gran Mutual has two wells which are monitored 24 hours per day and tested regularly.
The Environmental Protection Agency is concerned with setting standards. Local Public Health Agencies have regulatory responsibility.
California law on Municipal Water Companies determines the business practices and management of the water company. The link here goes to one of several directories to the State of California Code.
Information about the Clean Water Act and Environmental Regulation are the subject of another links pages on this web site.
The regulation link to the left is a .pdf file of 229 pages. It is a useful aid to finding the laws and rules about water safety and delivery. They warn you that this is just a staff guide, not the law.