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In 2018, Bulgaria had 332 urban waste water agglomerations of more then 2 000 population equivalent (p.e). These agglomerations generated a total load of 7 060 902 p.e. 90% of this load is connected to collecting systems and 5% addressed through Individual and Appropriate Systems (storage or septic tanks, micro-stations,...). These agglomerations are connected to 1 primary treatment plant, 7 secondary treatment plants and 104 more stringent treatment plants. All these treatment plants have a total design capacity of 8 582 178 p.e.

Agglomeration : Generated load by collection

Generated Load by collection type (population equivalent – p.e.)
See the data table
Generated Load by collection type (population equivalent – p.e.)
See diagram
Destination2018
Collected by collecting system6,336,719 pe, 89.7 %
Individual and Appropriate Systems348,437 pe, 4.9 %
Discharged without treatment375,746 pe, 5.3 %
Total7,060,902 pe, 100 %
*pe: Population equivalent, *%: Rate
Generated Load by sewage network type (population equivalent – p.e.)
See the data table
Generated Load by sewage network type (population equivalent – p.e.)
See diagram
Network type2018
Separative and combine system11,848 pe
1 na
No information7,016,281 pe
329 na
Combine system32,773 pe
2 na
*pe: Population equivalent, *na: Number of agglomerations

Agglomeration : Generated load by compliance

Total generated load by compliance (population equivalent – p.e.)
See the data table
Total generated load by compliance (population equivalent – p.e.)
See diagram
Compliance state2018
Compliant2,100,408 pe
Not Compliant4,958,230 pe
Not relevant2,264 pe
Total7,060,902 pe
*pe: Population equivalent
Number of agglomerations by compliance
See the data table
Number of agglomerations by compliance
See diagram
Compliance state2018
Compliant107
Not Compliant224
Not relevant1
Total332
*: Number of elements

Waste water treatment plant : Load entering by compliance

Total load entering by compliance (population equivalent – p.e.)
See the data table
Total load entering by compliance (population equivalent – p.e.)
See diagram
Compliance state2018
Not connected0 pe
Not Compliant1,062,819 pe
Compliant3,670,170 pe
Total4,732,989 pe
*pe: Population equivalent
Number of treatment plants by compliance
See the data table
Number of treatment plants by compliance
See diagram
Compliance state2018
Not connected144
Not Compliant29
Compliant83
Total256
*: Number of elements

Waste water treatment plant : Load entering by treatment type

Total load entering by treatment type (population equivalent – p.e.)
See the data table
Total load entering by treatment type (population equivalent – p.e.)
See diagram
Treatment type2018
Secondary treatment292,695 pe
Primary treatment1,535 pe
More stringent treatment4,438,759 pe
Not connected0 pe
Total4,732,989 pe
*pe: Population equivalent
Number of treatment plants by treatment type
See the data table
Number of treatment plants by treatment type
See diagram
Treatment type2018
Secondary treatment7
Primary treatment1
More stringent treatment104
Not connected144
Total256
*: Number of elements

Agglomeration : generated load by agglomeration size

Total generated load by agglomeration size (population equivalent – p.e.)
See the data table
Total generated load by agglomeration size (population equivalent – p.e.)
See diagram
Size2018
< 10,000 pe946,206 pe
10,000 to 100,000 pe2,489,487 pe
> 100,000 pe3,625,209 pe
Total7,060,902 pe
*pe: Population equivalent
Number of agglomerations by size
See the data table
Number of agglomerations by size
See diagram
Size2018
< 10,000 pe233
10,000 to 100,000 pe88
> 100,000 pe11
Total332
*: Number of elements

Waste water treatment plant : Total load entering and discharged

Total load entering and discharged
See the data table
Total load entering and discharged
See diagram
2018
ParameterEnteringDischarged
BODdata not available40.10 tons/year
CODdata not available14,695.63 tons/year
Ndata not available3,042.21 tons/year
Pdata not available333.21 tons/year
BOD, COD, N, P concentration
See the data table
BOD, COD, N, P concentration
See diagram
2018
ParameterEnteringDischarged
BODdata not available0.09 mg/l
CODdata not available34.16 mg/l
Ndata not available7.07 mg/l
Pdata not available0.77 mg/l

MS Level statistics

Sludge destination
See the data table
In 2018, 53,758 Tons DS of sludge was generated
Sludge destination
See diagram
In 2018, 53,758 Tons DS of sludge was generated
Destination2018
Discharged into surface waters : Pipelines0.0
Discharged into surface waters : Ships0.0
Discharged into surface waters : Others0.0
Re-used: Soil and agriculture29,857.0
Re-used: Others8,834.6
Disposed: Landfill3,680.3
Disposed: Incineration0.0
Disposed: Others11,386.3
Missing0.0
Total53,758.3
mslReuseOthers is recultivation of terrains, biogas, compost with red Californian worms; mslDisposalOthers is temporary disposal at drying fields

Legal compliance

Legal compliance for collection in p.e.
See the data table
Legal compliance for collection in p.e.
See diagram
YearCompliantNot compliantNot relevant
20186,327,953707,95224,997
Legal compliance for collection by number of agglomerations
See the data table
Legal compliance for collection by number of agglomerations
See diagram
YearCompliantNot compliantNot relevant
20181611683
Legal compliance for 2nd treatment in p.e.
See the data table
Legal compliance for 2nd treatment in p.e.
See diagram
YearCompliantNot compliantNot relevant
20182,795,3763,869,95819,394
Legal compliance for 2nd treatment by number of agglomerations
See the data table
Legal compliance for 2nd treatment by number of agglomerations
See diagram
YearCompliantNot compliantNot relevant
20181202066
Legal compliance for 3rd treatment in p.e.
See the data table
Legal compliance for 3rd treatment in p.e.
See diagram
YearCompliantNot compliantNot relevant
20181,532,4494,074,888759,109
Legal compliance for 3rd treatment by number of agglomerations
See the data table
Legal compliance for 3rd treatment by number of agglomerations
See diagram
YearCompliantNot compliantNot relevant
20184742243