I've always believed in deduct meters, instead of irrigation being lumped into the sewer surcharge. Most of my purveyors resisted on resi systems, and were even hard to convince for commercial. It would take a CPA to figure the $ gain over the years vs. the cost of the deduct, but I've always thought it was worth it. A 1" meter is a big mother, and most purveyors freak out when one is suggested. As Matt's recent episode proves, a deduct meter is a cool way to tell if the excessive water bill is coming from irrigation or a leaky toilet.
That's nothing. last year I installed a system that called for 3 2" wet taps with accompanying meters. The purveyor in the town (the township controlled the water), tried to assess what they called a "heavy use fee" to the tune of $50,000 for all 3. The property owner fought it, and got it reduced to around 25K, which i still thought was a lot.
In NC if you live in a more populated county your sewer charge is determined by your metered water use. It cost's $750 for a 3/4 tap. A deduct meter used for irrigation will pay for itself in about 3-4 year's.