Do car battery replacement problems track share of residents living in coastline counties across states?
Across U.S. states, NHTSA owner complaints about car battery replacement run higher where share of residents living in coastline counties is higher, after adjusting for the makes sold in each state. This is an association across states, not proof that share of residents living in coastline counties causes this repair.
State reports of this repair against share of residents living in coastline counties, one dot per stateEach dot is a state: how much more (or less) than expected this repair is reported there, adjusted for the makes sold in the state, against its share of residents living in coastline counties
How to read it: Each dot is a state. Further right means more share of residents living in coastline counties; higher up means more complaints for this repair than expected (1.0 is average). If the dots climb to the right, reports of this repair rise with share of residents living in coastline counties.
What it shows: States with more share of residents living in coastline counties tend to sit higher on the chart across 51 states: a pattern in the data, not proof of cause.
Data: U.S. Census Bureau Coastline Counties list 2016 with state population, joined to NHTSA owner complaints, downloaded 2026-10-06 · 51 states. Chart: CalcScrape · calcscrape.com
The 10 states with the most share of residents living in coastline counties (Rhode Island, Delaware, Hawaii, Alaska, Florida, California, Washington, New York, Connecticut, Maine): reports of this repair run 11% above what the makes sold there would predict, and 9 of 10 are above expected. The 10 with the least (Wyoming, Utah, New Mexico, Nevada, Montana, Idaho, Colorado, Arizona, Oklahoma, Arkansas): 4% below, and 4 of 10 are above expected.
Exceptions: Florida is among the highest in share of residents living in coastline counties but reports below expected.
Split the states into thirds: the third with the least share of residents living in coastline counties runs 9% below what the makes sold there would predict, the middle third 1% below, and the third with the most 7% above. It steps up steadily.
For share of residents living in coastline counties, after allowing for the 1562 comparisons we ran, luck alone would produce a pattern this strong about 1 time in 429. Take out any single state and the share of residents living in coastline counties pattern still holds.
Weak spot: compare only states with similar cost of living index and the pattern keeps about 24% of its strength, so part of it may come from cost of living index instead of share of residents living in coastline counties.
Salt in coastal air corrodes exposed metal, so repairs to brakes, exhaust and body parts can follow.