I wouldn't worry about limiting to 30 psi if your compressor is small. I have a small 1 gal tank air compressor similar to this one:
It pumps up to 110 psig. I then tell the wife to open a faucet and I let her rip. It drops pressure very quickly. Then I let it pump up again and do the next faucet. The water lines don't really see a lot of pressure. I've done this 3 seasons, no problems.
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2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10