By TMZ Sports

More bad news for former WBC welterweight world champion Victor Ortiz (31-6-2, 24 KOs) - the boxer was charged with 2 misdemeanor counts of DUI stemming from his September arrest ... and officials are claiming that Ortiz was very drunk.

TMZ Sports broke the story ... Ortiz was arrested on Sept. 24th in Ventura County, California around 7 PM when cops pulled over his BMW and smelled booze.

Now, officials say Ortiz's blood alcohol count was MORE than .15 ... which is a huge deal because in California, that triggers a "special allegation" which carries a tougher penalty if convicted ... more jail, higher fines, etc.

Here's the real problem for Ortiz -- he's already on probation stemming from a 2015 battery case at a Kenny Chesney concert at the Rose Bowl.

If Ortiz's probation is revoked because of the DUI -- the judge could have him locked up.

Ortiz has been out of the ring since April of last year, when he was knocked out by former champion Andre Berto in their long-awaited rematch at the StubHub Center in Carson, California.

There is some talk of a potential showdown in the coming months with his career rival, Brandon Rios. The feud between the two boxers has been ongoing for several years, and for the first time there are no network or promotional boundaries to prevent the fight from taking place - and they both compete in the welterweight division.