Perform routine testing on water produced by your system or make arrangements for sampling to be completed. For most Group B water systems, this is a bacteriological sample at least once each year; a nitrate sample at least once every three years.

• Complete any follow-up monitoring when a sample shows the presence of coliform bacteria, or other unsatisfactory result.

Send copies of all sampling results directly to Public Health. Do not depend on water testing labs (except for samples taken to Public Health) to submit these results. "Fully approved" water system status, for example, depends on keeping current on the required routine monitoring.

Notify Public Health in the event that you have sample results that do not meet drinking water standards. Additionally, notify users of your water system in the event of a confirmed water quality problem.

• Informing Public Health and the people who drink the water from your system when you receive a unsatisfactory water sample result is important so that precautions can be made to minimize the chances of a health problem arising. In some cases, boiling water before drinking may be an appropriate temporary solution.

Notify Public Health of any changes to the water system.

• This includes, informing the department, when a new manager/purveyor takes over responsibility for the system and how and where he/she can be contacted, when any physical change is made, , etc.

Work with all the water system users to enforce a protective radius around your water source in accordance with all the water system users to enforce a protective radius around your water source in accordance with King County Board of Health Title 12.24.010.

• Provide for routine maintenance of the physical components of the water system either directly yourself, through another party using the system, or by contract with a water system maintenance company.
• Keep key records for your water system accessible for review by water system users and Public Health for the time period indicated.
• Records of any corrective action and public notification along with other records of operation and analyses for three (3) years; all bacteriological analyses collected from houses and other locations served by the water system and any turbidity analyses for a minimum of five (5) years; system evaluations and related material for ten (10) years; and all chemical analyses (e.g. nitrate tests) for as long as the system is in operation.