The database says Pasadena is using the
Texas Wide Area Radio Network (TxWARN) system and the Harris Co sites that are marked as simulcast in the database are shown in post #2
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Keep in mind this is a system of systems. Talkgroups on the RFSS 1/2 side do not come out of the RFSS3 sites. Some agencies in the Houston area are on the City of Houston layer (RFSS 3) and some are on the Harris county layer (RFSS 1&2). The challenge comes in finding out if they are a City customer or a Harris County customer and picking the appropriate RFSS sites.
As a rule, pick the simulcast cell they are geographically located in as a start. This isnt always the case (some ISD PDs are not allowed on the simulcast cells) but should get you close.
The other challenge is to figure out which TGs are on which RFSS. Typically the 5 digit TGs are on RFSS 3, but some of the newer ones are RFFS 1.
Pasadena public safety comes out of the RFSS 3 Simulcast as stated above, while their general goverment type stuff comes out of the RFSS 1 sites.