Thanks for the advice, but most people seem to be addressing the practical question rather than the legal question. I haven't consulted with a lawyer, because I was hoping tons of landlords have dealt with this issue enough to know what the law says (and because lawyers are expensive and I don't have a working relationship with one at present).
I found this info:
http://www.seattle.gov/civilrights/documents/RHB_Engl.pdf
"Limited-English Speakers
I don’t speak English well and some landlords refuse to talk with me
when I try to apply. Is this discrimination?
Probably. A landlord cannot turn away an applicant simply because of a strong accent or because communication with a limited-English speaker presents an extra challenge. This violates laws protecting people on the basis of “national origin.” Landlords and managers must make every reasonable effort to communicate. However, landlords have the right to do business in English and are not required to translate applications, lease agreements, etc.
Is a landlord required to hire an interpreter to help me through
an interview and application process?
If you need an interpreter, you will probably have to arrange and pay for the service yourself, or you might try getting a friend to help. If a landlord won’t let you bring someone who speaks English with you to read through your lease before signing, it could be an act of discrimination. Call your local fair housing agency.
My landlord is evicting me because I broke the rules, but I speak
very little English and didn’t know I was doing anything wrong.
What can I do?
As a tenant, it is your responsibility to follow the rules regardless of your language ability. However, a landlord must give you written notice that you have broken the rules, along with the opportunity to comply before you are evicted. If you understand little English, you should seek help from someone who can interpret official documents you receive or are asked to sign. These might include leases, notices to vacate or court orders regarding eviction."
This seems to indicate that I can request the tenant hire an interpreter or bring an English-speaking adult to serve as an interpreter during the application/interview process -- although the question is framed from the perspective of the applicant, it seems to say if the applicant feels they need an interpreter the landlord is not required to pay for one, not if the landlord feels they need an interpreter the applicant is required to provide one (a non-child interpreter).
It seems to me, however, to say that I do not, as a landlord, have the right to not rent to someone who has zero English-speaking ability. Even if I interpret the interpreter question in a pro-landlord way, and require the applicant to provide an interpreter, I'm still not allowed to not rent to them because the reasonable expectation that communication with them will be an unreasonable burden since they are likely to not have that interpreter during our future communications (lease violations, late rent notices, etc).
Giving the uncertainty in the law, it certainly seems like _it could_ be interpreted as discrimination to not be willing to conduct business with someone with virtually no English skills. (NOTE that this is NOT an issue of accent or national origin, it is purely a situation of inability to communicate in a language both of us know).