If you can find multiple reliable sources that say the same thing then it would seem to confirm it as correct.
Except those so-called reliable sources are propagating the same incorrect information. Just posting something multiple times and having others copy it doesn't make it accurate.
Why does it matter? Because I care about accurate reporting of facts and figures. And I think agencies and individuals and non-profits should care about that too.
If agencies and individuals and non-profits mean density (stream mile/area), then they should state density. But density != miles and "second in miles" is the factoid that is regurgitated everywhere, not second in density. And I guess if enough websites regurgitate inaccurate information, it becomes accurate? I don't know where it started, but everyone seems to run with it and it is an interesting phenomenon to watch the spread of inaccurate information. Who cares about accurate facts? It sure sounds sexier to say we're only second in something behind Alaska.. That's the sound bite and info out of context culture we live in.
Even more ironic? If you calculate stream density (what this "fact" is apparently morphing into as an alternative explanation of what it is), PA is first (as others have noted), not second. Alaska is #34 (!). If you only include perennial streams in the density calculation, Alaska does better, but its only number one ranking is in the total amount of stream miles and the total amount of perennial stream miles. So now we have an inaccurately reported fact (purportedly miles, but apparently density?), and then the density isn't even calculated correctly and the state we are supposedly behind is many slots below us, not one above us! If you only include perennial stream miles in the density calculation, we fall to number ten and Alaska moves to seven, but that's also not 1 and 2.
No matter how it is sliced, PA as second, only behind Alaska, is incorrect (although I'm sure there is some obscure statistic that this holds true in). It's not an accurate ranking based on density. It's not an accurate ranking based on total stream miles. It's not an accurate ranking based on total perennial stream miles. Nevertheless, PA government agencies cite this statistic. John Arway cites this statistic. TU cites this. Other organizations cite those organizations. Or they Google for a stat and find one that sounds nice. And the idea spreads.
Don't take my word on it. Do you own verification. I believe my calculations are accurate, but am always subject to errors.
Start with this data set (admittedly, it is older, but I haven't found anything newer in one place):
https://archive.epa.gov/water/archive/web/pdf/2000_06_28_305b_98report_appenda.pdf
Slight modification for Alaska data here (primarily an increase in overall stream miles and documentation of ephemeral stream miles):
https://science.house.gov/sites/republicans.science.house.gov/files/documents/epa/alaska2013.pdf
Source for land, water and total area for states:
https://factfinder.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=DEC_00_SF1_GCTPH1.US01PR&prodType=table
For Texas, I'm not sure where you are picking up the 80,000 miles but go here:
https://www.tceq.texas.gov/waterquality/watersuccess/waterqualitysuccess
In 2016, they assessed 26,000 stream miles, which they list as 14% of the total. By doing some simple math, the calculated total stream miles is much more than 80,000; it's greater than 185,000, which is in the ballpark of the EPA data.