If you have municipal water (or other common supplier), you get a bill for water delivered. Most places charge for sewer based on the amount of water delivered. (Your hint here is how many sewer lines have a meter on them).
In our area, your sewer bill is based on the lowest month/quarter consumption, typically winter. That removed irrigation water from being billed for sewer services, but you pay the water rate for the delivered water. (My example is I am billed for 14,000 gallons per quarter for sewer service (my winter water consumption), but my summer bill has the sewer at 14,000 gallons and water at 48,000 gallons (irrigating 0.5 acres in dry weather).
(Background - I designed the comprehensive sewer plans for multiple communities in my area - including determining required billing rates to operate and maintain the system components).