League rules here: 

OASA League Rules 

 ASA Website

OASA Bat List - Updated 2012

2013 Bat Rule Change:
Still no composite bats
Still must be ASA approved, but must be 2004 stamp, nothing older as too many pre-2004 bats are no longer approved and it is way too difficult to weed out which bats are not "hot" and which ones are okay.
This also removes any non-ASA bats.

We are currently re-labeling all bats. Since this will take a few weeks we are allowing old orange stickers to also be valid until we announce that only the new blue OASA labeled bats are valid for use.

2013 Changes

All bats must carry the ASA 2004 or newer certification stamp. No bats will be labeled going forward unless they carry the ASA stamp. All bats will be re-labeled in 2013 with new color sticker.

This means that a bat you used last year, with an orange OASA sticker, but does not have an ASA stamp, will not be allowed for use next season.

2012 Changes

1) Pass - New Rule is as follows:
29. Base stealing is not allowed. Leading off is not allowed. The base runner may leave the base only when the batter makes contact with the ball. There is no courtesy step. If the runner leaves the base without batter contact with the ball (fair or foul), the runner is out.

2) Pass - New Rule is as follows:

Each team will begin extra innings with a baserunner at 2nd base. The runner shall be the batter whom made last out in the previous inning.

3) Pass - New Rule is as follows:

Runner has mat. Catcher has plate. No collisions. Runner must be tagged out on a non-force out play to be called out.

Bat Rules

ALL BATS MUST BE "OASA" LABELED FOR ALL LEAGUES  

Reminder about Bat rules for OASA all leagues: When buying a new bat, or questioning if a bat can be used in the OASA league ask yourself the following:

1) Is there any Composite material in the bat?
If Yes, the bat CAN NOT be used. No Composite material is accepted in the league.

2) Review the ASA approved bat list and ensure the bat is listed there. All bats must be on the ASA approved list AND must be ASA 2004 or 2013 certified - but - this is the last criteria of acceptance.

Bats approved in the OASA league must not be composite and must be on the ASA Approved List.

These rules are in place for the safety of players and due to the field dimensions that we play on. If you are ever unsure if a bat that you want to bring in to the league is allowed, please send an e-mail to OASA - Bat Question  or e-mail the OASA Equipment Advisor Aaron LaVoy directly.

We have updated the to clearly indicate Bats that are OK for use and those that are Banned.

New Rule

New 2010: Senior’s League Exception: Allowance for one player who has a season-ending injury to be replaced after the roster lock deadline (at the start of the SummerFest tourney). That injured player cannot return to the roster until the next season. Roster move must be approved by the commissioner.

Banned Bats

What if you suspect the other team is using a banned bat?
If the bat has no OASA sticker, do not pitch to them. Instruct the batter/team that you will only pitch to legal bats.
If a bat has a label, but you suspect it is banned, contact Randy so he can research. Some bats that were legal last season have been banned by the ASA this season and consequently are not legal in OASA. If bat is banned, Randy will notify the manager to remove sticker and issue warning to not use again. Future use will result in forfeits of games banned bat used in.