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20. Provisions (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Provisions Details Narrative Abstract |  |
Lawsuits filed by commercial customers | 890 | 1,070
Lawsuits which customers claim a reduction in the sewage tariff | 490 | 680
Lawsuits which customers plead reduction in tariff | 40 | 50
Tax claims related to income tax and social contribution | R$ 53,430 | R$ 52,192
Tax deficiency notice related to sewage services | 605,008 | 547,510
Offset requests for the extinction of IRPJ/CSLL payable | 36,070 | 42,173
Request for an authorization to offset taxes | 52,427 | 51,374
Lawsuits related to taxes and fines - accrued | 17,682 | 40,123
Lawsuits related to taxes and fines - contingent liabilities | 677,786 | 582,168
Intangible assets related to the municipalities | 114,335 | 114,335
Indemnities receivable | 109,990 |
Increase in lawsuits deemed as contingent liabilities | 464,800 |
Legal and administrative agreements | 48,353 |
Legal and administrative agreements related to construction | 46,538 |
Legal and administrative agreements related to environmental indemnifications | 1,835 |
Environmental indemnifications | 44,828 | 43,014
Guarantee insurance for escrow deposit | 160,377 | R$ 101,192
Renewed guarantee insurance | R$ 500,000 |

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