Mule Skinner, NJ charges separate bills for water and sewer. Sewer rate is typically calculated at ~ 159% of the water usage x the metered water. That covers the costs for sewer treatment, whether or not the town in question has separate storm water sewers (ie: cities like Newark, Trenton which are densely populated either have combined sewers or separate storm & sanitary sewers, depending on certain blocks.)
In suburbs, they either have separate storm sewers, or if there is enough open space, they don't have storm sewers, they just have run off ditches on the main roads, and some smaller ditches on the residential streets. The typical max. allowed impervious area is about 30-40% depending on the town, which means the rest of the property will take the rain run off and recharge the ground water. In larger parcels (commercial, etc) they make them put in drywells, etc, and there is provisions for small overflow pipe ~2" to flow into the municipal sewer system if there is a major rain storm and the private detention facility gets overwhelmed. So there are mechanisms for stormwater retention and means of billing for any overflow that already in place.
The problem is with densely populated cities, where there is not 1 " of grass in back yards or front yards and every time it rains, they get flooded, and property damage in basements, because there is more developing going on, and the infrastructure below ground is still from the 50's and 60's. Think of a typical 8", 10" or 12" pipe for a combined sewer that was adequate for use in 1950, and now 75 years later, that same pipe is getting sanitary and storm flow for a larger area, and more residents as cities have gone up vertically.
Passing a law to collect more money from residents statewide in suburbs who pay more in property taxes, and who do not have a storm water problem, to give to certain densely populated municipalities who only vote one way, is a more accurate definition of socialism than what you wrote in your last paragraph. As stated above, the cost for sewer treatment (sanitary and storm) is already billed at 159%, this is just another money grab statewide.
PS. Take the above with a grain of salt:
I only lived communism, followed by a shortlived democracy, and then communism come back masked as socialism in Europe. Then I migrated to America in 1999, and thank God everyday I live here, while it's still a free country, if we can manage to keep it.
But what do I know? Just go to work everyday to pay more taxes.