Mass. Gen. Laws ch. 111, § 167: Protection of sources of water supply

Section 167. No sewage, drainage, refuse or polluting matter, of such kind and amount as either by itself or in connection with other matter will corrupt or impair the quality of the water of any pond or stream used as a source of ice or water supply by a town, public institution or water company for domestic use, or render it injurious to health, and no human excrement, shall be discharged into any such stream or pond, or upon their banks if any filter basin so used is there situated, or into any feeders of such pond or stream within twenty miles above the point where such supply is taken.