Pond Permits & Regulations by State

It depends on the site, the size of the work and the state. Under federal law, discharging dredged or fill material into waters of the United States needs a Section 404 permit (a nationwide, regional or individual permit) unless the discharge is exempt, while an activity outside those waters, or one that involves no discharge, does not need one. EPA says a Clean Water Act permit is required for stormwater discharges from construction activity that disturbs 1 acre or more, or less than 1 acre as part of a common plan of development or sale that will ultimately disturb 1 acre or more, and FEMA says a permit is required before construction or development begins within any Special Flood Hazard Area. State rules can also apply. In Pennsylvania, for example, DEP says a Dam Permit is needed to build a dam across a watercourse if any one of DEP's limits on contributory drainage area (100 acres), water depth (15 feet) or impounding capacity (50 acre-feet) is exceeded. DEP adds that when a dam is below those limits, either a Water Obstruction and Encroachment Permit or an approved Environmental Assessment is still required if the dam is proposed across (or impacts) a stream or impacts a wetland, or if a stream or wetland is to be excavated or a wetland impounded. DEP also says Chapter 102 erosion and sediment control requirements apply whether or not the pond work needs Chapter 105 authorization. For construction such as pond excavation, the Chapter 102 regulation requires erosion and sediment control best management practices even for disturbance under 5,000 square feet, and a written erosion and sediment control plan when disturbance will be 5,000 square feet or more or in other listed cases. [1][2][3][7][23][24]

It depends on the state. The Corps says most dams in the National Inventory of Dams are regulated by state agencies through construction permits, inspections and/or enforcement. State definitions of a jurisdictional dam differ; the data dictionary for the Corps' National Inventory of Dams (August 2024) gives New Mexico as an example, where a jurisdictional dam is one that exceeds 10 feet in height regardless of storage, or stores more than 10 acre-feet regardless of height. In Pennsylvania, for example, Chapter 105 regulates a dam on a natural or artificial watercourse (other than one licensed under the Federal Power Act) if one or more of these apply: its contributory drainage area exceeds 100 acres; the greatest depth of water, measured at the upstream toe at maximum storage elevation, exceeds 15 feet; or its impounding capacity at maximum storage elevation exceeds 50 acre-feet. A Pennsylvania water-storage dam that is not on a watercourse and has no contributory drainage is regulated only if both the depth and the capacity limits are exceeded. FEMA notes that hazard potential classification systems vary between state and federal agencies, and that state dam safety regulators use them for purposes including assigning design requirements and determining the frequency of operation, maintenance and inspection activities. [5][6][7][25]

Only from certain Clean Water Act requirements, and only if the exemption's conditions are met. The Act says a discharge of dredged or fill material for the construction or maintenance of farm or stock ponds is not prohibited by or otherwise subject to regulation under Section 404 or sections 301(a) or 402, except for section 307 effluent standards or prohibitions and except as its recapture paragraph, 404(f)(2), provides. Under Corps regulations a permit is still required if the discharge contains a toxic pollutant listed under section 307, or if it is part of an activity whose purpose is to convert an area of waters of the United States to a use to which it was not previously subject, where flow or circulation may be impaired or reach reduced. EPA says both conditions must be met for an otherwise exempt activity to lose its exemption this way: the activity represents a new use of the water, and it would reduce the reach or impair the flow or circulation of regulated waters, including wetlands. Farm ponds that lose the exemption because of recapture may be authorized by Nationwide Permit 40, which covers farm ponds in non-tidal waters of the United States, excluding perennial streams, provided the pond is used solely for agricultural purposes; the discharge must not cause the loss of more than 1/2 acre of non-tidal waters of the United States, and a pre-construction notification to the district engineer is required before work starts. The current nationwide permits took effect March 15, 2026 and expire March 15, 2031. EPA directs people to their local Corps District office or EPA regional office to find out whether a specific activity is exempt. State rules can also apply: in Pennsylvania, for example, DEP says Chapter 102 erosion and sediment control requirements apply whether or not the pond work needs Chapter 105 authorization, and for construction such as pond excavation the Chapter 102 regulation requires erosion and sediment control best management practices even for disturbance under 5,000 square feet. [1][9][10][23][24][26]

Not necessarily a Section 404 permit, but other permits can still apply. Corps regulations say an activity that takes place outside waters of the United States, or that does not involve a discharge, does not need a Section 404 permit. According to EPA's rule status page (last updated September 9, 2026), EPA and the Army are implementing the Amended 2023 Rule in 24 states, including Pennsylvania, plus the District of Columbia and the U.S. territories; under that rule, artificial lakes or ponds created by excavating or diking dry land to collect and retain water, and used exclusively for purposes such as stock watering, irrigation, settling basins or rice growing, are not waters of the United States, even where they would otherwise meet paragraphs (a)(2) through (5) of the rule's definition. In the other 26 states, EPA and the Army interpret waters of the United States consistent with the pre-2015 regulatory regime and the Supreme Court's Sackett decision until further notice. The pre-2015 rules do not codify that exclusion; in the 2023 rule's preamble, the agencies say such ponds were generally not considered waters of the United States, although the Corps and EPA each reserved the right to find, case by case, that a particular one is a water of the United States. Construction stormwater rules are separate: EPA's Construction General Permit guidance says coverage is generally needed when construction disturbs 1 acre or more and discharges stormwater to waters of the U.S., and that no permit is needed if all of the construction stormwater is captured on site and not discharged to a receiving water, with on-site controls that are effective under any size storm. State rules can also apply. In Pennsylvania, for example, DEP says Chapter 105 approval for water obstructions and encroachments is not required for an off-stream pond that is not built in a floodway, wetland or other body of water, but a dam permit may be required if its dam meets the regulated-dam criteria. Under Chapter 105, a water-storage dam that is not on a watercourse and has no contributory drainage is regulated only if the greatest depth of water at its upstream toe exceeds 15 feet and its impounding capacity exceeds 50 acre-feet, both at maximum storage elevation. [1][7][23][27][28][29][30]

It can, depending on how much ground the work disturbs and which state the pond is in. EPA says a Clean Water Act permit is required for stormwater discharges from construction activity, including clearing, grading and excavating, that disturbs 1 acre or more, or less than 1 acre if it is part of a common plan of development or sale that will ultimately disturb 1 acre or more. EPA's Construction General Permit guidance adds that the earth disturbance has to be part of a project to build, demolish or replace a structure to trigger permit coverage (its examples are a building, road, pad, pipeline or transmission line), and that where clearing, grading or excavating down to bare soil takes place, coverage is required if at least one acre is disturbed, separately or as part of a larger plan of development. The same guidance says no permit is needed if all of the construction stormwater is captured on site and not discharged to a receiving water, with on-site controls that are effective under any size storm; if there is a potential for a discharge, EPA recommends obtaining coverage before any discharge occurs. According to EPA's August 3, 2026 notice on its draft 2027 Construction General Permit, EPA itself is the construction stormwater permitting authority in places including Massachusetts, New Hampshire, New Mexico, the District of Columbia and most Indian country lands. A state can run its own EPA-approved NPDES permit program. State erosion rules can reach smaller jobs. For construction such as pond excavation or embankment work, Pennsylvania, for example, requires erosion and sediment control best management practices even for disturbance under 5,000 square feet, and a written erosion and sediment control plan when disturbance will be 5,000 square feet or more or, among other listed cases, when the activity, because of its proximity to existing drainage features or patterns, has the potential to discharge to a High Quality or Exceptional Value water. Other than for agricultural plowing or tilling, animal heavy use areas, timber harvesting or road maintenance, Pennsylvania also requires an individual NPDES permit or coverage under a general NPDES permit before earth disturbance of 1 acre or more begins, including earth disturbance that is part of a larger common plan of development or sale involving 1 acre or more. [2][11][12][24][30][31]

Where the work is in a Special Flood Hazard Area, FEMA says a permit is required before construction or development begins, and the National Flood Insurance Program (NFIP) counts dredging, filling, grading and excavation as development. A Special Flood Hazard Area is the land subject to a 1 percent or greater chance of flooding in any given year. State and local governments enforce the NFIP rules, and participation in the NFIP is voluntary; FEMA's Community Status Book shows whether a community participates, does not participate, or is suspended or sanctioned. Inside an adopted regulatory floodway, the community must prohibit fill and other encroachments unless hydrologic and hydraulic analyses, performed in accordance with standard engineering practice, show they would not result in any increase in flood levels within the community during the base flood discharge. A community may permit a floodway encroachment that would increase base flood elevations only if it first applies for a conditional Flood Insurance Rate Map (FIRM) and floodway revision, meets the requirements of 44 CFR 65.12, and receives FEMA approval. FEMA's criteria are minimums that any community may exceed, so the details depend on the state and the community; Pennsylvania's floodplain development guide (PEMA, June 2025), for example, says the municipality must issue a floodplain development permit, or its equivalent, before any development in the Special Flood Hazard Area. [3][4][14][15][16][32][33]

Conservation Practice Standard Pond (Code 378) is the Natural Resources Conservation Service's design standard for a pond, which NRCS defines as a water impoundment made by building an embankment, digging a dugout, or both. It applies to all excavated ponds, but to embankment ponds only if they meet all of its low-hazard criteria, including storage times effective height of less than 3,000 acre-feet times feet and an effective height of 35 feet or less. NRCS policy instead requires low-hazard earth dams with storage times effective height of 3,000 acre-feet times feet or more, dams more than 35 feet in effective height, and all significant- and high-hazard dams to meet or exceed Technical Release 210-60. The standard itself requires ponds to be planned, designed and built to comply with all Federal, State and local laws, and requires the landowner to obtain all necessary permits before construction. NRCS's national page lists the standard document as July 2022 but says national standards should not be used to plan, design or install a practice; each state adapts them in its Field Office Technical Guide, and state versions may be more restrictive but cannot be less stringent. As of September 28, 2026, Pennsylvania's active version, for example, is dated October 2023. [18][19][20][21][34][35][36]