Safety index · Cardiff · data through August 2026
Is Pontprennau and Old St Mellons safe?
Pontprennau and Old St Mellons sits at the safer end of Cardiff by reported crime. Its SafeRoute safety index is 75 out of 100 — 17 points above the Cardiff median of 58, ranking 6th of 28 Cardiff wards — based on 50 incidents reported to South Wales Police within 1 km of the ward centre over the month to August 2026.
DATA THROUGH AUGUST 2026 · 1 MONTH OF DATA
The 0–100 scale is calibrated to Cardiff — a typical Cardiff ward sits near 58. It ranks Pontprennau and Old St Mellons against other wards here, and cannot be read against a score in another city.
The largest reported category here is violent crime (30% of reports) — worth taking seriously when walking at night; the full mix is broken down below.
Where incidents cluster
What's reported here
| Violent crime | 15 · 30% | |
| Anti-social behaviour | 11 · 22% | |
| Public order | 10 · 20% | |
| Criminal damage & arson | 5 · 10% | |
| Shoplifting | 3 · 6% | |
| Vehicle crime | 2 · 4% |
Walking in Pontprennau and Old St Mellons at night?
SafeRoute scores every walking route against the same official crime data on this page — and shows how much of each route runs on lit streets. Compare the routes and share your walk. Free, no account.
Get SafeRoute on the App StoreNearby areas
- Llanrumney48/100 · Elevated
- Pentwyn59/100 · Moderate
- Cyncoed75/100 · Low risk
- Trowbridge58/100 · Moderate
- Lisvane and Thornhill95/100 · Low risk
Common questions
Is Pontprennau and Old St Mellons safe at night?
Low risk overall (safety index 75/100). Reported crime is low for Cardiff, but stick to lit, busier streets late.
What is the most common crime in Pontprennau and Old St Mellons?
Violent crime — 15 of 50 incidents (30%) reported within 1 km of the ward centre over the month to August 2026.
How is the Pontprennau and Old St Mellons safety index calculated?
SafeRoute weights each police-recorded incident by severity (violence weighs more than shoplifting), sums the last published month within 1 km of the ward centre, and normalises against Cardiff rates onto a 0–100 scale — higher is safer. It describes reported crime only; it is not a guarantee of safety. The scale is calibrated within Cardiff, so scores compare wards to each other and cannot be read against another city's.