What is the legal limit for paying with coins in Washington state?
We can't answer state specific questions as we are not experts in the laws of every states. However, that said there is no U.S. law that requires a private business to accept coin as payment. Since you are dealing with U.S. currency, these laws should prevail.
Just as a private business can tell you, "no bills greater than a $20 accepted", they can refuse coin. This doesn't happen often, but it does happen. If you walk into a business and want to pay a $20 debt with 2,000 pennies, it takes a lot of time to process that transaction, counting the pennies. That business may be charged extra at the bank because of all the coin. The bank may not want all of that coin, so they have to pay to send it to the Federal Reserve Bank via armored car. You can get more information on this and the laws that made coins acceptable as legal tender at the Treasury.
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