CMWSSB Complaint Analytics

Category	Street	Depot	Times	Span (days)	Avg gap (days)	Per month
Sewer Main Block	Venkatachalam Street	119	66	547	8.4	3.62
No Water Supply	Venkatachalam Street	119	20	507	26.7	1.18
Sewer - House Block	Venkatachalam Street	119	11	384	38.4	0.86
Sewer Main Block	Venkatachalam Street	121	7	449	74.8	0.47
Water Pollution	Venkatachalam Street	119	4	318	105.9	0.38
No Water Supply	Venkatachalam Street	121	4	64	21.4	1.87

Avg gap = average days between consecutive complaints of that type on that street. Lower gap / higher “per month” = a faster-recurring, unresolved problem.

🔬 Advanced Analysis

Pareto — the vital few (which categories drive most complaints)

Categories ordered by volume with their cumulative share. The highlighted rows are the smallest set that together account for ~80% of all complaints — fix these first.

Category	Count	Share	Cumulative
Sewer Main Block vital	73	61.3%	61.3%
No Water Supply vital	24	20.2%	81.5%
Sewer - House Block	12	10.1%	91.6%
Water Pollution	4	3.4%	95%
Sewer Machine Hole Open (or) Broken	3	2.5%	97.5%
Others	2	1.7%	99.2%
Water Leakage in Service Line / Main Line	1	0.8%	100%

When complaints arrive (weekday × time of day)

Load pattern across the week — darker cells are busier six-hour windows. Useful for staffing and planning proactive checks before the peak.

	Night	Morning	Afternoon	Evening	Total
Mon		11	7	1	19
Tue		13	8	4	25
Wed		7	6	3	16
Thu		7	5	1	13
Fri		9	6	1	16
Sat		8	6	4	18
Sun		5	6	1	12
Total	0	60	44	15	119

Linked problems (category pairs that hit the same streets)

Pairs of issue types that recur together on the same street, ranked by the number of streets where both appear. Strong pairs point to a shared root cause worth fixing in one visit.

Problem A	Problem B	Shared streets
Not enough overlapping complaints in this scope.