Depends on the shape of the system, IMO. If there is nothing unsafe about you system and you call the gas company because your stove leaked a little bit from the pilot orifice, and the yard has to be dug up and sheetrock repaired, or in the case of my house, because you cant fit in the crawlspace, the floor cut out in several spots, don't you think that is a little excessive? It would have been a simple fix to pop in a new stove, as opposed to a large plumbing bill because some city inspector thinks the main line running through the house is a 1/4" too small to service the kitchen? You think you won't see that bill tucked in there when your lease renews? What would have been a $300 stove that was replaced and forgotten about as normal wear and tear on an old stove is now a "needless" expense and a $50 or more increase in your rent, costing you at least double that. Things like that also factored in when 3 or 4 air conditioners go out, you get pushed to the end of the list, instead of the top. Sounds good for the tenant to me to let the landlord fix problems with his house instead of going over his head, but that just could be me. Now if there is something obviously wrong, gas is bubbling up through your yard, and the landlord won't deal with it, sure, call the gas co.