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Temporary streamside fencing and signs work only when each has a defined job: an exclusion fence marks the no-work line, while a sediment barrier keeps muddy sheet flow out of the stream buffer. On projects covered by the U.S. Environmental Protection Agency’s 2022 Construction General Permit (CGP), mark the required buffer before earth disturbance, install downslope perimeter controls before opening soil, and post the permit notice where the public can read it. State permits can require different dimensions or signs, so use the state erosion-and-sediment-control manual whenever it is the permitting authority.
What should be installed before streamside construction starts?
Complete this sequence before clearing, grading or excavation:
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- Identify the receiving stream and the agency issuing the construction-stormwater permit.
- Determine whether the EPA CGP buffer provision applies: a water of the United States within 50 feet of the planned earth disturbance is the federal trigger.
- Choose and document a buffer compliance alternative in the Stormwater Pollution Prevention Plan (SWPPP).
- Measure and mark the buffer line with flags, tape or a visible temporary fence.
- Install the sediment barrier on the contour, uphill of the buffer and downhill of exposed soil.
- Keep stockpiles, clearing debris and equipment outside the buffer and away from concentrated flow.
- Post the public permit-coverage notice and add any state-required sensitive-area placards.
- Brief operators that the exclusion fence is a stop line, not a suggestion.
The EPA’s 2022 CGP, as modified in 2025, is the controlling federal permit where EPA is the NPDES authority as of November 2026. It expires February 16, 2027; a proposed 2027 permit was still not in force on the research date.
Why are two different fences needed?
An exclusion fence protects the place; a silt fence or other perimeter control protects the water. Neither substitutes for the other.
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- Exclusion fence: Orange plastic web, snow fence, boards, or cord and flagging makes the buffer or sensitive-area boundary visible to machine operators. It is not designed to filter runoff.
- Sediment barrier: Silt fence, compost filter sock, filter berm, gravel barrier or temporary diversion dike ponds muddy sheet flow so particles settle before runoff reaches the buffer. It does not stop rain from detaching soil, so stabilization practices such as mulch, seeding or blankets remain necessary.
EPA describes silt fence as “a temporary sediment barrier made of porous fabric” and calls it a last line of defense. Where space allows, route dirty water to a sediment basin or another primary practice instead of relying on a single fence.
How close can I grade to a creek?
Where the EPA CGP applies and a receiving water is within 50 feet of earth disturbance, retain a 50-foot undisturbed natural buffer, or use one of the permit’s equivalent-control alternatives. Measure perpendicular from the ordinary high water mark (OHWM) or from the top of the bank, bluff or cliff, whichever is farther inland.
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Appendix F requires the line to be visibly marked before earth disturbance:
“prior to commencing earth-disturbing activities on your site, you must delineate, and clearly mark off, with flags, tape, or a similar marking device, the buffer area on your site.”
Its stated purpose is to make the protected area visible to workers so unintended disturbance is avoided. During permit coverage, earth-disturbing activity inside the buffer is prohibited unless an applicable exception is documented.
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Keep one alternative for the permit term and show its width and controls on the site map:
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- Full buffer: An undisturbed natural strip 50 feet wide.
- Narrower buffer plus equivalent controls: A strip shorter than 50 feet combined with erosion and sediment controls that provide the sediment-load reduction of a 50-foot natural buffer.
- No undisturbed buffer where infeasible: Controls that provide the same reduction, with the infeasibility explanation and retained width recorded in the SWPPP.
A buffer does not have to be planted if it was bare rock or sand before construction, and the CGP does not require enhancement of existing vegetation. EPA encourages replacing invasive plants with site-adapted natives and leaving leaf litter and woody debris in place. If another owner controls part of the strip, protect the portion the operator controls and document the limitation.
Exceptions include certain work authorized under a Clean Water Act §404 permit and water-dependent structures such as piers, boat ramps and trails. The exception does not waive the buffer for unrelated earth disturbance beside that work. A pre-existing building or pavement occupying the entire strip can make a natural buffer inapplicable; if only part was developed, the natural remainder still counts. Linear projects with a tight right-of-way must limit disturbance within 50 feet to the extent feasible and add supplemental controls, with the rationale in the SWPPP.
What kind of fence marks a stream buffer or sensitive area?
Use a high-visibility physical barrier where equipment operates. Surveyor’s flagging or tape satisfies the federal marking language, but a fence is easier to see in dust, rain and low light. Tell the crew that crossing or moving it requires the superintendent’s approval.
Delaware DNREC’s DE-ESC-3.7.2 detail (effective January 2026) is a useful state example, not a nationwide specification. It permits:
- Plastic web fence: 40-inch international-orange polyethylene web on metal T- or U-posts driven at least 18 inches, with posts no more than 6 feet apart. The detail lists average tensile-yield values of 2,000 pounds and 2,900 pounds per 4-foot width and elongation greater than 1,000 percent under ASTM D638.
- Snow fence: Standard 40-inch snow fence on steel posts at 6-foot spacing.
- Board fence: Secure 4-inch-square posts protruding at least 4 feet, with at least two horizontal boards.
- Cord and flagging: Posts at least 2 inches square or in diameter, two cord rows at least 2 feet apart, and surveyor’s flagging no more than 3 feet apart.
- Earth berm: A temporary dike at the clearing limit only where it will not redirect drainage.
For trees, Delaware’s detail places fencing outside the mature dripline and never within 5 feet of the trunk. Trunk armoring is a last resort; nothing is nailed to a tree, and the root zone inside the dripline remains protected. The detail requires protective devices before excavation or grading, good repair throughout construction, and removal during final cleanup.
Retail “orange plastic safety fence” commonly comes in 4-foot rolls rather than exactly 40 inches. Match the manual’s height, web construction and post spacing; do not treat a retail roll as automatically approved. Orange web is an exclusion device, not a mud filter.
How do I install the silt fence uphill of the buffer?
Place the sediment control on the contour, between exposed soil and the buffer. Turn both ends uphill so runoff cannot flank the barrier. A crescent or J-hook layout creates storage; a straight run aimed at one low point usually concentrates flow and overtops.
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- Size the drainage area. EPA’s silt-fence fact sheet says the area above one fence should usually not exceed one-quarter acre. A rule of thumb is at least 100 feet of fence per 10,000 square feet of disturbed area, adjusted for soil, slope, slope length and rainfall. These are design guidance, not a CGP equation.
- Break up long slopes. On a long, steep slope, EPA suggests a fence near the head and another 6 to 10 feet from the toe, leaving a storage area between them. The bottom of each turned-up end should be higher than the top of the middle so an extreme storm spills over the crest instead of cutting around an end.
- Embed the fabric. EPA’s published installation options are static slicing—a 12-inch slit followed by wheel compaction on both sides—or a trench about 6 inches wide by 6 inches deep. Poor compaction lets water pipe underneath. State manuals may prescribe a different method.
- Set posts deeply and closely enough. EPA recommends about 2 feet of embedment, with spacing of 3 to 4 feet where water may run over the top, 5 feet in most areas, and 6 to 7 feet only where horizontal loading is low. The fence should support about 24 inches of sediment and water. Steel posts are easier to drive deeply than ordinary 2-by-2 hardwood.
- Attach fabric as one structure. For steel posts, use three 50-pound-test plastic ties per post in the top 8 inches, each on a post nipple and set diagonally. For wood posts, use several staples and a wood lath over the fabric.
- Turn the ends uphill. Use J-hooks or similar returns at both ends and at breaks in grade. Inspect the low side for bypass paths before accepting the installation.
EPA states: “A silt fence should not be placed in a channel with continuous flow … nor across a narrow or steep-sided channel.” If needed, run it parallel to the channel on the land side to intercept sheet flow. A fence across the creek is not a stream crossing and will fail as concentrated water goes around, under or through it.
Where roots make trenching undesirable, a compost filter sock or another permit-listed perimeter control may be appropriate if the state manual allows it. Heavier loading may justify wire-backed or chain-link-supported fabric, at additional cost and disposal effort.
Do I still need silt fence if I leave a 50-foot buffer?
Yes. The buffer and perimeter-control duties are independent. EPA’s frequent-questions page states that the natural buffer requirement in Part 2.2.1 “does not substitute for” the Part 2.2.3 requirement to install perimeter controls along areas receiving pollutant discharges. The 2022 permit also places perimeter controls upgradient of the natural buffer.
Install the sediment barrier before opening soil above it, and treat water before it enters the buffer. Keep soil piles and clearing debris outside the buffer and away from concentrated flow. Put a barrier on every downgradient side; the CGP examples include berms, dikes, fiber rolls, silt fences, sandbags, gravel bags and straw bales. Cover piles that will sit unused for 14 days or more in accordance with the stabilization requirements.
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There are three different field items, and combining them causes omissions.
1. Buffer marks
Flags, tape or an exclusion fence mark the worker-facing limit. The federal CGP supplies no universal legend, panel size or spacing for these marks.
2. Public notice of permit coverage
The EPA CGP requires a sign or other notice at a safe, publicly accessible location near the site, visible from the nearest public or tribal road. The notice must use type large enough to be readily viewed from that right-of-way. At minimum, include:
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- the NPDES permit tracking number;
- the EPA permit-search page where the Notice of Intent can be found;
- a contact name and telephone number; and
- the SWPPP URL, or a statement directing readers to the appropriate EPA regional office for a copy.
A weatherproof board or document box at the entrance is a practical format, but state permits may prescribe their own notice or form. Texas, for example, uses separate small-site and large-site notices under its state permit, and linear projects may move the notice along the work.
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State details can require signs attached to the field fence. Delaware’s detail says that when silt fence is used for demarcation, appropriate “sensitive area protection zone” signage is required at least every 20 feet. That 20-foot interval is Delaware’s rule for that use, not a national requirement. A high-visibility exclusion fence with clear “Do not enter—stream buffer” wording is generally less confusing than trying to make sediment fabric serve as the boundary.
When do I put the fence in, and when can I take it out?
Install both the exclusion mark and the downslope sediment control before disturbing the ground they protect. Keep them functional through construction, stabilization and final cleanup.
- Before disturbance: Mark the buffer and install the exclusion fence. Install perimeter controls before clearing, grading or excavating above them.
- During work: Keep machines, spoil and access routes on the work side. Repair displaced sections immediately and document changes in the SWPPP.
- After storms: Inspect for undercutting, flanking, sagging, broken posts and sediment buildup. Remove deposits before they reach one-half of the above-ground height.
- During inactivity: If work permanently stops or will be inactive for 14 or more calendar days, start stabilization as soon as practicable and no later than the end of the next business day. Where five acres or less are disturbed at one time, complete stabilization as soon as practicable and no later than 14 calendar days; do not assume that deadline applies to larger disturbed areas.
- At final cleanup: Remove sediment controls when permanent stabilization makes them unnecessary, dispose of damaged fabric and posts properly, reuse sound steel posts, spread suitable trapped sediment as topsoil, and seed or mulch. Leave the exclusion fence until the last cleanup activity, then remove it.
EPA’s fact sheet gives 70 percent vegetative cover as the trigger in one lakeshore project example; it is not presented here as a universal CGP definition.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How often should the controls be inspected and cleaned?
The permit requires routine maintenance to begin immediately and finish by the close of the next business day. If that is infeasible, document why and complete it within seven calendar days. The same defect recurring at the same location three or more times is a corrective-action issue, not routine maintenance.
A secondary reading of Part 4.2 by SWPPP Desk describes inspections every seven days, or every 14 days plus a 24-hour inspection after rainfall of at least 0.25 inch. Confirm the current permit and state schedule before putting that interval in the project inspection plan.
Do not simply scrape a clogged fence and assume the fabric is restored. Wet sediment may make access unsafe; a stable deposit can sometimes remain while a second fence is installed above or below it. Maintain an access path so an inspector can reach the entire perimeter.
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What changes when work must touch the stream?
In-channel or bank work is a separate authorization problem, often involving Clean Water Act §404 and state §401 water-quality certification. A §404-approved water-dependent structure may qualify for a buffer exception, but unrelated disturbance beside it does not. Use the agency-approved temporary-crossing design for any crossing; a silt fence across flowing water is not an acceptable substitute.
If a berm or other permanent barrier means no stormwater can discharge through the strip between the disturbed area and the receiving water, the CGP buffer provision may not apply. Document that hydraulic condition rather than assuming a barrier automatically qualifies.
What records belong in the SWPPP?
Show the receiving water, OHWM or bank reference, measured buffer width, exclusion-fence line, perimeter controls, stockpiles, access routes and discharge points on the site map. In the narrative, identify the chosen buffer alternative, any infeasibility rationale, the inspection and maintenance method, and the sediment-removal trigger at one-half of the control’s above-ground height.
For EPA-authorized projects disturbing one or more acres—or a smaller portion of a common plan that will ultimately disturb one or more acres—the NOI is generally due at least 14 calendar days before construction starts. Authorization begins 14 calendar days after EPA confirms a complete NOI unless the agency delays or denies coverage. Emergency work can use provisional coverage when a complete NOI is submitted within 30 calendar days after starting, under the permit’s emergency provisions.
Most projects are covered by a state construction general permit instead. State manuals can change post spacing, burial depth, sign language, inspection timing and acceptable alternatives. Verify the issuing agency and use its current manual before ordering materials.
Field checklist for the superintendent
- Permit authority and permit number confirmed.
- Receiving water and OHWM or top-of-bank line identified.
- Buffer alternative and retained width recorded in the SWPPP.
- Buffer marked before the first scoop of soil.
- Orange web, snow, board or cord fence installed at the work limit.
- Silt fence or approved equivalent installed on contour, uphill of buffer and downhill of exposed soil.
- Ends turned uphill; no barrier crosses a continuously flowing channel.
- Posts embedded and spaced to the applicable state or EPA detail.
- Stockpiles and debris outside the buffer with downgradient protection.
- Public permit notice readable from the nearest public or tribal road.
- State-required sensitive-area signs installed at the specified interval.
- Inspection access maintained; sediment removed at one-half height.
- Stabilization started immediately for areas inactive 14 days or more.
- Exclusion fence removed last, after stabilization and final cleanup.
What is the practical rule?
Set a visible stop line before work, set a separate sediment-control line before runoff can reach it, and manage each under the permit that actually covers the site. The 50-foot EPA buffer is not permission to omit perimeter controls, and a silt fence is never a license to block a flowing stream.
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Frequently Asked Questions
Can I use orange safety fence as a silt fence?
No. Orange polyethylene web is an exclusion marker that shows where crews must stop; its open mesh does not pond and settle sediment. Use a permit-approved sediment barrier, such as silt-fence fabric or a compost filter sock, for runoff control.
What if the stream is less than 50 feet from an existing building?
If pre-existing development occupied the entire strip before the project was planned, the EPA CGP treats a natural buffer as absent there. If only part of the strip was developed, protect the remaining natural portion and document the condition in the SWPPP.
Can a property owner move the buffer fence to get equipment through?
Only under the project’s approved plan and applicable permit provisions. Moving it without documenting the change can create an unauthorized buffer disturbance; establish a designated access route or obtain the required agency approval first.
Who decides whether the EPA CGP or a state permit applies?
The NPDES permitting authority for the project location controls. EPA’s CGP applies only in areas where EPA is the authority; elsewhere, the state construction permit and erosion-and-sediment-control manual can impose different dimensions, sign wording and inspection schedules.
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