The WSJ is reporting that both Texas and Colorado have now adopted rules requiring disclosure of frac fluid constituents: "The rules are part of a broader effort by states to show they are serious about regulating the rapidly expanding hydraulic fracturing ahead of possible new federal rules governing chemical disclosure, water disposal, air emissions and well construction." (Note: Subscription may be required.) For more on the Texas program, see here (the Houston Chronicle) and here (for a copy of the rules). For more on the Colorado program, see here (the Colorado Independent) and here (for a copy of the rules).