1. What is a riparian area?

A riparian area is the land beside a stream. It shades and protects the water, filters runoff and holds the banks together.

Under BC's Riparian Areas Protection Regulation (RAPR):

• The riparian assessment area is a 30 m (98 ft) strip on each side of a stream, measured from the stream boundary. It's wider where the stream is in a ravine.
• A "stream" is broader than you might think. It includes a watercourse "whether or not usually containing water", and a ditch, spring or wetland connected to it by surface flow.
• "Development" includes adding, removing or changing soil or vegetation. Digging a drain, shaping a swale or placing fill in that strip counts.
• There's an exemption for maintaining an existing disturbed area (for example, an existing driveway), as long as it isn't made bigger and the type of disturbance doesn't change (s.3(3)(b)).

What that means for you: resurfacing an existing driveway in its existing footprint is treated differently from digging something new. New drains, ditches, fill or outlets inside the 30 m strip need a professional assessment first.

2. Mission's riparian permit area

The City of Mission maps riparian areas as a Development Permit Area for riparian protection. On its Land Development & Planning page, the City says permits are required for development in the mapped areas and any other land within the riparian assessment area. Before the City issues that permit:

• A Qualified Environmental Professional (QEP) prepares an assessment report.
• The Province must approve that report.
• Mission's Zoning Bylaw says no disturbance may occur in the streamside protection area except as the QEP report determines (Zoning Bylaw 5949-2020, s.108).

Practical tip: plan new drainage works outside the mapped riparian area and at least 30 m (98 ft) from any visible channel. If that isn't possible, bring in a QEP before you design anything.

3. Mission's land clearing rule (forest ecosystems)

Much of Mission is also covered by a forest ecosystems development permit area. According to the City's Land Clearing Management Program:

• A development permit is needed once new land disturbance passes 200 m² (2,153 ft²) in a calendar year inside the urban growth boundary, or 500 m² (5,382 ft²) outside it.
• Some maintenance activities are exempt, but the exemptions don't apply in riparian areas.

Practical tip: keep new trenches, swales and rock pads small, and add them up. Ask Planning if you're unsure whether your work counts as maintenance.

4. Bringing in gravel or moving soil

Mission's Soil Management Bylaw 6133-2022 treats gravel, sand and rock as "soil" (s.2), so road base, crushed gravel, drain rock and riprap all count.

• No permit is needed for up to 100 m³ (131 yd³) deposited or removed in a calendar year (s.12(a)). Above that, you need a soil permit.
• Even when you're exempt, the bylaw's general rules in s.15 still apply:
  • Don't obstruct or damage any drainage facility, natural watercourse or aquifer.
  • Don't interfere with neighbours' drainage, and don't send water onto adjoining land at a greater rate than before.
  • No fill within 3 m (9 ft 10 in) of a property line unless a qualified professional certifies there's no adverse impact.
  • Nothing deposited or removed in a streamside protection area without senior-government authorization.
  • Clean mud or debris off roads and out of roadside ditches daily.

5. Creeks and fish: provincial and federal rules

• Water Sustainability Act, s.11: changes "in and about a stream" need provincial authorization. The Act's definition of changes in and about a stream includes changing the land, the vegetation or the flow of water in it, and it covers channels that are dry part of the year. Don't re-route, deepen or line a natural gully or creek without it.
• Fisheries Act, s.36(3): nobody may deposit a deleterious substance where it may enter water frequented by fish. Muddy runoff from a fresh excavation can count. Use silt fence or wattles below the work, work in dry spells, and cover bare soil and stockpiles the same day.

6. Neighbours, the road and roadside ditches

• Neighbours: besides the Soil Bylaw rules above, BC courts generally don't allow you to collect or concentrate water and discharge it onto a neighbour's land in a way that causes damage (a law firm overview: general information, not legal advice). Spread water out on your own property.
• The road: Mission's Good Neighbour Bylaw (s.12.7) prohibits water flowing from private land onto a street or public place in a way that creates a hazard.
• Roadside ditches: Mission's Sewer Bylaw counts ditches as watercourses, and work in the road right-of-way needs City Engineering approval. Don't tie a private drain into a roadside ditch without it.

7. Check your own property in five minutes

1. Open the City of Mission WebMap and search your address.
2. Turn on the layers for property lines, development permit areas (look for riparian protection), watercourses / streams and contours.
3. Look for any mapped stream, including ones marked "speculated". Treat a speculated stream as real until a QEP says otherwise.
4. Note roughly how far the riparian area is from where you want to work.
5. Remember it's GIS mapping, not a survey. If you're close to a line, a BC Land Surveyor can confirm it, and a QEP can confirm where the stream boundary really is.

8. A simple plan that usually stays inside the rules

For a typical small drainage or driveway job, this approach keeps you clear of most permit triggers. Confirm the details with the City.

• Work inside the existing footprint where you can (that's maintenance).
• Keep new work outside the riparian area and 30 m (98 ft) from any channel.
• Keep total new disturbance under 200 m² (2,153 ft²) this calendar year.
• Count every load of gravel and rock, and stay under 100 m³ (131 yd³) this calendar year.
• Spread water out on your own land with many small outlets, well back from property lines (no fill within 3 m / 10 ft).
• Don't connect a new pipe or ditch to a creek, gully or roadside ditch.
• Keep water off the road.
• Use silt fence, work in dry weather, and stabilize bare soil the same day.
• Request a locate from BC 1 Call before digging, and find your own well, septic tank and field.

9. Who to call

Sources

1. Riparian Areas Protection Regulation, B.C. Reg. 178/2019: s.1 definitions ("stream", "development"), s.3(3)(b) maintenance, s.8 30 m assessment area. https://www.bclaws.gov.bc.ca/civix/document/id/complete/statreg/178_2019
2. City of Mission, Land Development & Planning (riparian and forest ecosystem development permits; QEP report approved by the Province). https://www.mission.ca/planning
3. City of Mission, Land Clearing Management Program (200 m² / 500 m² thresholds; exemptions don't apply in riparian areas). https://www.mission.ca/land-clearing
4. City of Mission, Zoning Bylaw 5949-2020, s.108 (no disturbance in a streamside protection area except per QEP report). https://www.mission.ca/media/file/5949-2020-zoning-bylaw-completepdf
5. City of Mission, Soil Management Bylaw 6133-2022 (consolidated), s.2, s.6, s.12(a), s.15. https://www.mission.ca/media/file/soil-management-bylaw-6133-2022pdf
6. Water Sustainability Act, SBC 2014 c.15, s.1 and s.11. https://www.bclaws.gov.bc.ca/civix/document/id/complete/statreg/14015
7. Fisheries Act, R.S.C. 1985 c. F-14, s.36(3). https://laws-lois.justice.gc.ca/eng/acts/f-14/page-5.html
8. City of Mission, Good Neighbour Bylaw 5524-2015, s.12.7. https://www.mission.ca/media/file/good-neighbour-bylaw-5524-2015pdf
9. City of Mission, Sewer Bylaw 5033-2009 ("watercourse" includes a ditch). https://www.mission.ca/media/file/sewer-bylaw-5033-2009pdf-0
10. City of Mission, Engineering general inquiries. https://www.mission.ca/contact/general-inquiries-engineering
11. City of Mission WebMap (GIS, not a survey). https://www.mission.ca/webmap
12. Meridian Law Group, Stormwater management conflicts between neighbours (law firm article, general information). https://meridianlawgroup.ca/stormwater-management-conflicts-between-neighbours-in-vancouver/
13. BC 1 Call. https://www.bc1c.ca/

Last reviewed October 2026. General information only, not legal advice. Confirm with the City of Mission before starting work.