I test the water quality every few years with a commercial testing service just to be sure there are no latent problems. No other service needed. After 32 years, I just changed out the pump at the bottom of the well as preventative maintenance, as it was still working fine but I felt it was way out on its useful life limits and did not want it to fail in the winter or when we had a large water need. Wells are different than septic systems. which need their tanks pumped every 5 years or so, again depending on usage. At 15 years, we have been advised to pump both chambers and replace the pump to avoid problems. That is what our septic service recommends.
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