Environmental Aspect & Risk Matrix
List environmental aspects, score severity × frequency, and rank risks on a 5×5 matrix to prioritise controls.
List each environmental aspect, rate severity (impact if it occurs) and frequency, and the matrix ranks them by risk = severity × frequency so you can prioritise controls.
Risk matrix (severity × frequency/likelihood)
| L1 | L2 | L3 | L4 | L5 | |
| S5 | 5 | 10·1 | 15 | 20 | 25 |
| S4 | 4 | 8 | 12·1 | 16 | 20 |
| S3 | 3 | 6 | 9 | 12 | 15 |
| S2 | 2 | 4 | 6 | 8 | 10 |
| S1 | 1 | 2 | 3 | 4 | 5·1 |
·n = number of items on that cell. ≥15 high / 8–14 medium / ≤7 low.
Ranked risk profile
| # | Environmental aspect | Risk | Level | Controls |
|---|---|---|---|---|
| 1 | 生产废水排放 | 12 | Medium | 纳管排放，COD/氨氮在线监测，月度第三方检测 |
| 2 | 危险废物贮存 | 10 | Medium | 危废间防渗防漏、分类标识、转移联单台账 |
| 3 | 办公纸张消耗 | 5 | Low | 双面打印、电子审批替代纸质流转 |
- The 2 medium-risk item(s) go into operational control (8.1): write the operating rule, set the monitoring frequency, define what happens on an excursion.
- The 1 low-risk item(s) keep current controls and stay on the routine inspection list.
- Re-score with the same matrix after the controls are in place — close the item only when the residual risk drops to acceptable.
- Review at least annually, and immediately when processes, raw materials or legal requirements change.
Serves these standards
About this tool
ISO 14001 asks every organisation to identify the environmental aspects of its activities and determine which are significant (Clause 6.1.2). That significance decision is the engine of the whole EMS: it drives operational controls, objectives, training, monitoring and even emergency preparedness. Get it wrong and the rest of the system manages the wrong things.
This tool walks you through the standard scoring approach: list each aspect (emissions, waste, energy, water, spills…), score its severity and frequency, and plot the result on a 5×5 matrix. The high-scoring corner is your significant aspects shortlist — the one that needs documented controls (Clause 8.1) and measurable objectives.
Frequently asked questions
What counts as a significant environmental aspect?
Any element of your activities, products or services that interacts with the environment and scores high on your criteria — typically severity of impact multiplied by frequency, likelihood or scale. There is no universal threshold: the standard requires you to define criteria and apply them consistently, and to document the result.
What is 'life cycle perspective'?
Clause 6.1.2 requires considering the life cycle of your activities and products — raw materials, transport, use and end-of-life — not only what happens inside your fence. You control the depth: consider each stage and justify where you stop, rather than doing a full LCA.
What do I do with the significant aspects?
They must flow into operational planning and control (Clause 8.1), environmental objectives (Clause 6.2), competence and training (Clause 7.2/7.3), monitoring and measurement (Clause 9.1) and emergency preparedness (Clause 8.2). Auditors trace the chain: aspect → control → evidence.
How often should the register be updated?
After every significant change — new process, new chemical, new regulation — and at management review as a minimum. A register that has not changed in years usually means the organisation changed and the EMS did not.