Regulations, Reporting, and Public Health Protection
Regulatory questions test the Safe Drinking Water Act as Massachusetts implements it in 310 CMR 22.000, the classification of systems and operators, and the reporting and public-notice clocks that follow a violation.
System and operator basics
A public water system serves at least 25 people for 60 or more days per year, or has 15 or more service connections. Types are community (year-round residential), non-transient non-community (schools, factories), and transient non-community (restaurants, campgrounds). Massachusetts licenses operators at grades 1 through 4 for groundwater and surface water systems and requires a designated operator of record. The Board of Certification of Drinking Water Operators sets renewal and training requirements.
Reporting and public notice
- Tier 1: within 24 hours for acute risks such as an E. coli MCL violation, a nitrate exceedance, or a treatment technique failure with pathogen risk.
- Tier 2: within 30 days for less urgent violations.
- Tier 3: annual, within 12 months, for monitoring and reporting violations.
- Consumer Confidence Report: delivered to customers each year by July 1, covering the previous calendar year.
- Monthly operating reports and MassDEP notifications follow the schedules in the regulations.
Worked example
A community system serving 2,000 people plans routine coliform monitoring. Under the population-based table, a system in the 1,001–2,500 band collects 2 routine samples per month. Doubling the population does not double the sample count - the table steps up gradually.
Traps
Treating a transient non-community system as community. Missing the July 1 CCR deadline. Applying a 30-day Tier 2 window to an acute violation. Assuming the operator of record need not be told about process changes.