SiteKiln gives you plain-English information, not environmental or legal advice. If you need a permit for construction activity in Wales, contact NRW's permits team or an environmental consultant.
# Natural Resources Wales (NRW), Permits and Responsibilities for Construction
Think of NRW as the Welsh version of the Environment Agency, they're the people who can say "yes", "no", or "absolutely not" to what you do with water, waste, and certain works on or near site.
1. What NRW is and why you care
Natural Resources Wales (NRW) is the environmental regulator for Wales. It was created in 2013, taking over from the Environment Agency Wales, Forestry Commission Wales, and the Countryside Council for Wales.
NRW is the adviser to Welsh Government and the regulator for water, waste, forests, pollution, flooding, and wildlife in Wales.
For you as a tradesperson or small builder, that means:
- They issue permits and licences for certain construction activities (water discharge, abstraction, flood risk work, waste)
- They respond to pollution and flooding incidents · 24/7
- They can inspect your site and prosecute if you cut corners on environmental compliance
- They work alongside the SAB (SuDS Approving Body) on drainage and water quality
2. When you need an NRW permit
The rules mirror England in principle, but you deal with NRW (not the Environment Agency), and the forms, fees, and guidance are Wales-specific.
Water discharge and groundwater activities
Pumping site water (from over-pumped excavations, dewatering, basements) into a ditch, stream, river, or into the ground via soakaways can need an environmental permit unless it qualifies for a registered exemption.
The critical rule: if the water is contaminated with silt, cement, fuel, chemicals, or anything else, it will almost never be exempt. Silty water turning a stream brown is one of the most common construction pollution incidents NRW deals with, and one of the easiest to prevent.
Clean, uncontaminated water from dewatering may qualify for an exemption, but check with NRW first, not after you've already pumped it.
Water abstraction
If you're abstracting (taking) more than 20 cubic metres per day from a river, stream, or groundwater for construction use: dust suppression, concrete batching, wheel washing, you may need an abstraction licence from NRW.
The threshold and process differ from England. Check NRW's abstraction guidance before assuming your English experience applies.
Flood risk activities
Working in, under, over, or near a main river, sea defence, or flood defence structure can need a flood risk activity permit from NRW.
Common triggers:
- Building or altering culverts
- Bridge works or abutments
- Installing outfalls or headwalls
- Bank reinforcement or stabilisation
- Piling or excavation within 8 metres of a main river (16 metres for a tidal river)
"Near" is interpreted broadly. If in doubt, check with NRW before starting, it's cheaper than being told to stop and undo what you've done.
Waste
Storing, treating, or disposing of construction waste (excavated soils, rubble, contaminated material) on site or at your yard can fall under waste permitting.
- Small-scale, low-risk activity may be covered by a registered waste exemption (free to register, lasts 3 years)
- Larger-scale or longer-term storage and treatment needs a proper waste permit from NRW · application fee, compliance conditions, inspections
- Hazardous waste (asbestos, contaminated soil, certain chemicals) has additional requirements regardless of quantity
See our guide on Environmental & Waste (Section 11) for more detail.
NRW permits and permissions hub
All applications, forms, fees, and guidance: naturalresources.wales/permits-and-permissions
3. How NRW differs from the Environment Agency
The underlying law · the Environmental Permitting (England and Wales) Regulations 2016 · covers both countries. But implementation and enforcement are split.
| Wales (NRW) | England (Environment Agency) | |
|---|---|---|
| Who you apply to | Natural Resources Wales | Environment Agency |
| Application forms | NRW's own forms and portal | EA's own forms and portal |
| Fee scales | Set by Welsh Government policy | Set by Defra/EA policy |
| Enforcement approach | NRW's civil and criminal framework | EA, including new variable monetary penalties (England only) |
| Policy emphasis | Heavy emphasis on SuDS, water quality, biodiversity, climate resilience | Broadly similar but different priorities on some issues |
Bottom line: the concepts are familiar if you work in England, but you cannot reuse EA forms, assume English fee tables, or apply for permits through the EA portal for Welsh sites. It's a different regulator with its own process.
Recent changes giving the Environment Agency new variable monetary penalties apply only to England. Wales has its own enforcement framework, don't assume the same penalty levels apply.
4. Construction site water management, what NRW expects
NRW's general position on construction is simple: don't let dirty water leave your site.
For a small builder, that means:
Before you dig
- Plan water management before excavation starts · don't wait until the hole is full and you're panicking
- Check whether any excavation dewatering will need an NRW exemption or permit
- Identify where surface water runs off site and where the nearest watercourse or drain is
On site
- Silt control: use settlement tanks, silt fences, silt socks, straw bales, or proprietary treatment systems if you're pumping water off site. Silty water into a stream is the number one construction pollution incident in Wales.
- Cement and concrete: never wash tools, chutes, or mixers straight into drains, ditches, or rivers. Cement is highly alkaline · it kills fish and invertebrates. Contain all washout water and dispose of it properly.
- Fuel and chemicals: store in bunded areas (the bund must hold 110% of the container volume), away from drains and watercourses. Spill kits should be on site wherever fuel is stored.
- Track-out: mud and silt carried off site on vehicle wheels can end up in road drains and watercourses. Use wheel washing or rumble grids where necessary.
NRW's guidance for construction
NRW's "advice for developers and construction" pages are the best starting point:
naturalresources.wales/guidance-and-advice/business-sectors/planning-and-development/advice-for-developers
These link into SuDS, SAB, water quality, and flood risk guidance.
5. NRW and SAB, how they fit together
Two different bodies, two different functions:
| SAB | NRW | |
|---|---|---|
| Run by | Local council (each Welsh authority has a SAB) | Natural Resources Wales (national body) |
| Focuses on | Surface water drainage design for new developments (SuDS) | Environmental impacts: water quality, flood risk, pollution, waste, habitats |
| When involved | New developments over 1 dwelling or 100m² construction area | Whenever construction activity affects water, watercourses, waste, or protected sites |
| Approval needed | SAB approval (separate from planning) | Environmental permits where required |
In practice:
- SAB sign-off is about how you deal with rainwater on new developments · SuDS design, attenuation, run-off rates
- NRW permits kick in where you're pumping or discharging water, altering watercourses, or handling waste and pollution risks
- They communicate where needed · for example, a SuDS scheme outfalling to a main river may trigger both SAB approval and NRW's flood risk and water quality interest
If you're a small builder:
- Check that the designer or client has got SAB approval where needed (see our SAB and SuDS guide)
- Ask early whether any NRW permits are in place or needed for dewatering, working near rivers, or waste stockpiles
- Don't assume that SAB approval covers everything · NRW's remit is wider
6. Reporting pollution incidents
If something goes wrong, diesel spill, silt turning a stream brown, concrete getting into a drain, chemical leak, report it to NRW immediately.
NRW Incident Hotline (24/7)
0300 065 3000 · Option 1 for incident reporting
You can also report online via the NRW website.
They'll ask for:
- Location · grid reference, or "off [road name], near [landmark]"
- What's happened · colour and smell of water, volume, source if known
- When it started or was discovered
- Photos if you can take them safely
Why reporting matters
Reporting early and cooperating with NRW will always look better than trying to hide it and being caught later. NRW's enforcement guidance explicitly considers whether the polluter reported promptly and took immediate action to contain the damage.
If you caused the incident through genuine accident and responded well, the outcome is usually very different from someone who knew about it and hoped nobody would notice.
7. Penalties for non-compliance
If you ignore the rules, operate without required permits, or cause pollution, NRW can:
Enforcement notices
Stop-work notices and remediation notices requiring you to clean up, restore, or cease the polluting activity.
Civil penalties and fixed penalties
For certain offences, NRW can issue penalties without going to court. These are designed to be proportionate but meaningful.
Criminal prosecution
For serious environmental offences:
- Unlimited fines: courts can fine whatever they consider appropriate. Fines for construction water pollution cases are routinely in the tens of thousands of pounds for significant incidents
- Imprisonment · in extreme or repeated cases, individuals (directors, site managers, sole traders) can face custodial sentences
- Criminal record · which affects everything from insurance to pre-qualification
Wider consequences
Even without prosecution, environmental incidents can lead to:
- Stop-work orders and programme delays
- Remediation costs · cleaning up a polluted watercourse is extremely expensive
- Higher insurance premiums at renewal
- Loss of framework positions · main contractors will drop subcontractors who cause environmental incidents
- Reputation damage · NRW publishes enforcement actions
"We'll just pump it and hope" is not a business strategy.
What to do next
- If you're working on a site in Wales: check whether any NRW permits are needed before you start dewatering, discharging, or working near a watercourse
- Plan water management before excavation · silt fences, settlement tanks, contained washout areas
- Store fuel in bunded areas away from drains and watercourses
- If an incident happens: call NRW immediately on 0300 065 3000 · reporting early is always better than being caught later
- If you're pricing work in Wales: factor in the cost of water management, silt control, and any NRW permit fees
Sources
- Environment (Wales) Act 2016 · legislation.gov.uk/anaw/2016/3
- Environmental Permitting (England and Wales) Regulations 2016 · legislation.gov.uk/uksi/2016/1154
- Water Resources Act 1991 (abstraction licensing) · legislation.gov.uk/ukpga/1991/57
- Flood and Water Management Act 2010, Schedule 3 · legislation.gov.uk/ukpga/2010/29/schedule/3
- Natural Resources Wales, Permits and Permissions · naturalresources.wales/permits-and-permissions
- Natural Resources Wales, Advice for Developers · naturalresources.wales
- CIRIA, Environmental Good Practice on Site Guide (C741) · ciria.org
- NRW Enforcement and Prosecution Policy · naturalresources.wales
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