Frequent Questions

How much data needs to be grandfathered?

A system can grandfather as much data as they have, as long as it meets the requirements.  If a system does not have 24 months of grandfathered data, it would start monitoring when required and could stop early, depending on how many months of grandfathered data had been approved. 

For additional guidance on the Long Term 2 Enhanced Surface Water Treatment Rule please visit

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