Each head will use UP TO 2.2 gallons a minute. You need to factor in the size of the pipe feeding the shower head(s) and transfer valves, as well as the size of the water main and it's pressure. Just because you have several shower heads, it doesn't mean you're actually using each one at it's peak flow rate. As someone who has a shower with multiple heads, I've found that opening up the second head greatly reduces the amount of pressure from both heads. This was planned for somewhat by running larger than normal lines to both the transfer valves and the shower heads... in the end, you're limited to what the utility provides.

My roommate regularly takes 1 hour long hot showers. I'm really glad we have a low-flow showerhead...

Thermal solar heated shower OK. Coal fired electrical hot water heater not so smart. Let the water rates be ramped up by volume and let the oil and gas double in price. That will solve the problem.

I personally deplore government intervention but feel it's a necessary evil for those amongst us who have no conscience.
I use approx. 5 gal of hot water during my "shower" by employing a trigger shut-off hand nozzle. The trick is to keep the bathroom door shut so as not to lose the warmth in your shower enclosure.

save water, shower with a friend :)

I like the idea of regulating shower heads, because you can get a decent shower from pretty much any modern shower head (Comfort/etc is a different story, but you will get clean). However, toilets need their regulation changed. The 1.8 gallon limit is terrible. I have to flush twice more often than not, so that uses 3.6 gallons, which is .4 higher than the old limit. A 2.2 size tank with dual flush would be a happy compromise, I expect.

I've considered powered toilets that use compressed air or something like that, but I'm concerned about the efficiency and the noise factor. Anyone have any comments on those?

Why they use beautiful women in those multi-shower head ads? Because beautiful women are extra DIRTY from having tons of sex. The more they shower, the more demand for their sex and eventually they'll need a bath room full of shower heads to wash off all that slimy man juice. Who says it's easy to be beautiful?

I dont think regulation is a good answer. Especially if the problem arises due to regulation (subvention) in the first place.
Some people just love their hot shower. You cant force everybody to drive a prius either, can you. Also, if you regulate showers to use half as much water, how do you want to stop people from showering twice as long. Maybe install cams with every shower?
If people use too much water or energy, its simply to cheap. Its as simple as that. If you are concerned for the elderly or similar, just give them the money you get from the more expensive commodity.
JM2C

I like my 3 gal/min shower, I throttle it back most of the time, but when sore muscles need heat, full pressure can be brought to bare.

Also missing in this arguement is some fancy showers recirculate water, thus probaby saving significant water.

Besides, I don't water my lawn like my idiot neighbors, so raise the water rates please.

I am all for raising rates, a long shower is nothing compared to cutting your grass too short and using gallons and gallons to water it.

There is not logic in it. Humans are illogical. Vulcans, however, are excellent conservationists. We could learn a lot.

the water an end user uses is nothing compared to the water footprint involved in industrial production. the factory farming industry alone uses an insane amount of water directly and indirectly to raise cows etc in a totally unsustainable way. your leather shoes took 6000 gallons of water from beginning to end. so how many hot showers is that, low flow or not.