Thameswater vs Severn Trent: most-reported complaints compared
Most-reported issues at Thameswater and Severn Trent, according to reviewers on Trustpilot — classified by our automated reader and backed by verbatim quotes from distinct reviews. This is a side-by-side of what reviewers report, not a score, rating or recommendation for either company.
Thameswater
TrustScore 3.9 · 6,271 reviews on Trustpilot.
602 reviews analysed, 2016-05-31 to 2026-11-09.
Complaint rate (recent window): 38%
93% of negative reviews get a company reply.
“I've been waiting 5 months for a revised bill from Thames Water.”
Severn Trent
TrustScore 4.9 · 41,724 reviews on Trustpilot.
2,746 reviews analysed, 2026-06-18 to 2026-11-12.
Complaint rate (recent window): 3%
100% of negative reviews get a company reply.
“Big mistake they jumped from £16 a month to £47.”
Reported on both
Issues with an evidenced category (at least two verbatim quotes) on both sides.
| Issue | Thameswater | Severn Trent |
|---|---|---|
| Support unhelpful | 52% | 30% |
| Billing errors | 39% | 27% |
| Poor core service | 23% | 28% |
| Support unreachable | 17% | 16% |
| Account/app problems | 8% | 8% |
Method: reviews are classified into a fixed complaint taxonomy by an automated reader; every category shown is backed by at least two verbatim quotes from distinct reviews. Figures are census classifications, not official statistics, and reflect what reviewers reported — not findings of wrongdoing by either company. Not affiliated with, endorsed by, or sponsored by Trustpilot A/S, Thameswater or Severn Trent.