A few towns in NH have enacted health ordinances to require regular maintenance and inspections (if system is so old it is not a state approved design) for their waterfront districts.
While I’m not often in favor of more regulations at the local level in this case it’s helping a town to protect its tax base and helping lakefront owners to protect the value of their property.
Thinking out loud I might not even be against a state mandate to require lakefront properties to maintain their systems. The state has done such things, such as “forcing” ADU (accessory dwelling unit) zoning on all NH towns.
https://www.deering.nh.us/sites/g/fi..._ordinance.pdf
https://www.chesterfield.nh.gov/buil...tem-regulation