Richland Is Named Great Place to Retire For Your Health by Kiplinger
Thanks to 300 days of sunshine great health care and relatively low cost of living makes Richland a 'Great Place To Retire For Your Health' according to Kiplinger.
The article which was published also mentions Richland's easy access to major cities such as Portland and Seattle as a plus. The other major factor to consider is that Washington state does not have state income tax.