In California High Schools the sport is growing steadily. Yes, it's predominantly the white & Asian suburbs, but the participation and quality are steadily rising unlike football.

Men's Lacrosse (number of High Schools) from http://www.laxpower.com/common/hs_boys.php

2010 / 2017 by region 2010:

46 / 56 North Coast CIF
29 / 37 Central Coast CIF (corresponds to San Mateo, Santa Clara, Santa Cruz, and Monterey counties)
67 / 98 Southern CIF
42 / 55 San Diego CIF
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184 / 246 CIF Totals

That is a 1/3rd expansion in the number of teams fielded in just 7 years. Probably closer to a 40% increase in the number of participants.

High schools sponsoring lag the growth in club, and colleges lag the growth in high schools. It's just a matter of time before some colleges sponsor out here. I honestly expect the WCC to be first, given so many of the high schools with the sport are in the various Catholic leagues.