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The metallicity of a supernova (SN) progenitor, together with its mass, isone of the main parameters that rules their outcome. We present a metallicitystudy of 115 nearby SN host galaxies (0.005<z<0.03) which hosted 142 SNe usingIntegral Field Spectroscopy (IFS) from the CALIFA survey. Using O3N2 we foundno statistically significant differences between the gas-phase metallicities atthe locations of the three main SN types (Ia, Ib/c and II) all having~8.50$\pm$0.02 dex. The total galaxy metallicities are also very similar and weargue that this is because our sample consists only of SNe discovered inmassive galaxies (log(M/Msun)>10 dex) by targeted searches. We also found noevidence that the metallicity at the SN location differs from the averagemetallicity at the GCD of the SNe. By extending our SN sample with publishedmetallicities at the SN location, we studied the metallicity distributions forall SN subtypes split into SN discovered in targeted and untargeted searches.We confirm a bias toward higher host masses and metallicities in the targetedsearches. Combining data from targeted and untargeted searches we found asequence from higher to lower local metallicity: SN Ia, Ic, and II show thehighest metallicity, which is significantly higher than SN Ib, IIb, and Ic-BL.Our results support the picture of SN Ib resulting from binary progenitors and,at least part of, SN Ic being the result of single massive stars stripped oftheir outer layers by metallicity driven winds. We studied several proxies ofthe local metallicity frequently used in the literature and found that thetotal host metallicity allows for the estimation of the metallicity at the SNlocation with an accuracy better than 0.08 dex and very small bias. Inaddition, weak AGNs not seen in total spectra may only weakly bias (by 0.04dex) the metallicity estimate from integrated spectra. (abridged)

Nearby supernova host galaxies from the CALIFA Survey: II. SN environmental metallicity