Not often, but a lot, as in volume. Stokie, who for the uninitiated and uninterested is a rescued feral, is still on antibiotics because when he’s off them his poo is not right. I don’t know if that has anything to do with it. Anyway, he seems to pee with the same frequency as the other cats, but he pees a lot of pee. (He drinks a good bit, too.) He’s happy, healthy, and getting fatter and glossier all the time, so it’s obviously not bothering him any. Do some kitties just pee more volume, or is it something I should worry about? (I know at least in humans that peeing frequently can be diabetes or a UTI or any number of things, but just peeing a lot?)
In my cat’s case, it turned out to be a symptom of diabetes. If I were you, I’d have the vet check him out.
[all the usual disclaimers, etc.]
Wiki sez, besides, yep, excessive urination, and excessive thirst (“he drinks a good bit, too” 
) being symptoms of feline diabetes…
Suggested as a quick check; if it comes up a resonant “No”, then that tells you something, perhaps saves you a $60 trip to the vet.
Think you can do the strip test on damp litter? I can’t imagine how to get a cat to pee in a cup.
Useful suggestions for collecting a urine sample from a cat. The most interesting: replace the cat litter with aquarium gravel. Then all you have to do is tip it up so the pee flows to a corner and stick the test strip in that.
The cat is only about a year and a half old, by the way.
Wiki sez it’s “unusual” in cats less than 7 years old, but then, Stokie’s an unusual cat, ain’t he? 
Lord, yes. His farts smell like Cheerios, did I mention that?
Both of our Maine Coons did this when they got older. They drank a lot, and peed frequently (and it seemed to be mostly water). They didn’t have feline diabetes, but they did have other health probelms. And, sadly, they’re both gone now.
I’d keep an eye on it just because it is a symptom of diabetes. It’s can also be related to prednisone (steroid) use, which when overused can cause diabetes.
However, it’s a good thing for a cat to take in, process, and eliminate a goodly amount of water. Too often, pet cats don’t get enough water and can develop a variety of urinary and kidney related problems.
We had to switch to all canned 'cause one of our cats wasn’t drinking (the dry food we had her on didn’t make her thirsty). She got a nasty urinary tract infection. They now produce copious quantities of urine.
They all like the cat fountain I got for them. When I first got Dewey he didn’t drink what I considered enough, but the fountain makes them drink more.
Diabetes is very unusual in young cats. My personal record would be a 5 year old cat. However, acute renal failure or early chronic renal failure, from things like prior ingestion of ethylene glycol, can happen at any age. I would suggest documenting water intake. Place a known volum of water in a dish (say 2 cups). Make sure it is the only water source. Feed no canned food (it is a water source). In 24 hours, measure remaining water.
Sure, there is some evaporative loss, but it is a good estimate of 24 hour water intake. Tell your veterinarian your cat’s weight and 24 hour fluid intake and he can advise what (if any) further testing is needed.
How prior would the ingestion have to be? I’ve had him for a couple months now and I know he didn’t get any antifreeze in my house.
I’ll lock him in the bathroom and see how much he drinks. I’ve noticed him drinking more water at one go from the fountain than the other cats.
Well, ethylene glycol was just an example. Kidney cells are lost every day, and new ones are not made. Anything that damages the kidney will accelerate the normal aging process. People tell me their cat drinks “too much” every day. Some of those cats just drink more than the owner considers normal, others are in kidney failure/diabetic/have liver disease/etc. Determining the fluid intake per 24 hour period is a good way to tell if you should be concerned.