select gid,st_isvalidreason(geom) from msft_ca_jul18 where not st_isvalid(geom);
--

   gid   |                   st_isvalidreason                    
---------+-------------------------------------------------------
 1932577 | Self-intersection[-117.879309006686 34.0939527158598]
 1083503 | Self-intersection[-118.151041032252 34.1665520003544]
   88756 | Ring Self-intersection[-119.076734 35.415403]
  876188 | Ring Self-intersection[-117.839459 34.114434]
 1929254 | Self-intersection[-118.399568098846 34.0733870185677]
 1584267 | Ring Self-intersection[-120.368949 36.148878]
  971380 | Self-intersection[-115.526362 34.51697]
 1479661 | Self-intersection[-122.271523 40.489851]
  159872 | Self-intersection[-117.386296 33.986578]
  466420 | Self-intersection[-117.16902821886 32.7842220517734]
  479762 | Ring Self-intersection[-118.256179 34.136154]
 1925936 | Self-intersection[-118.826453155039 34.0236350172265]
 2225164 | Self-intersection[-119.612751 36.753547]
 2117902 | Self-intersection[-120.071738998454 36.7212750803865]
 2065877 | Self-intersection[-118.152639368984 34.1486450053476]
 2882693 | Self-intersection[-118.088771000294 34.0555769797317]
 2673688 | Self-intersection[-117.937368998871 34.0454461038814]
 2701485 | Self-intersection[-118.138405825079 34.0202376049337]
 2557510 | Self-intersection[-119.248434012696 34.2700550170241]
 3593228 | Ring Self-intersection[-122.269776 40.165107]
 3274502 | Ring Self-intersection[-121.404124 38.601195]
 3427607 | Self-intersection[-117.06367295762 32.7679220271869]
 3062584 | Self-intersection[-122.277526033611 41.2310760003395]
 3185093 | Self-intersection[-117.128387 35.420909]
 5237743 | Self-intersection[-118.242398 33.894502]
 4474549 | Self-intersection[-121.424849098185 38.5407842676858]
 3881251 | Ring Self-intersection[-117.692986 35.589367]
 4268230 | Self-intersection[-117.190929 32.835074]
 5215196 | Ring Self-intersection[-122.235024 38.107347]
 4195530 | Self-intersection[-122.399941999677 37.652617027442]
 4873241 | Ring Self-intersection[-117.971194 35.12292]
 3882578 | Self-intersection[-120.977585999333 37.6746839532773]
 4197067 | Self-intersection[-119.468601022591 36.1837711193082]
 4053150 | Self-intersection[-121.417985026441 38.3405507051047]
 4231901 | Ring Self-intersection[-121.707147 36.940447]
 3934724 | Self-intersection[-118.401244 34.1527850694444]
 3956371 | Self-intersection[-117.970015998596 33.8302379326158]
 3934100 | Ring Self-intersection[-118.245364 34.218844]
 4482100 | Self-intersection[-117.006337998805 32.738465111099]
 4023275 | Self-intersection[-118.31865 33.7877300108303]
 4354462 | Ring Self-intersection[-118.565846 34.078259]
 5310650 | Self-intersection[-117.885100999011 34.1099770731587]
 5244655 | Self-intersection[-116.344896 33.719872]
(43 rows)