Indonesia sets industrial effluent limits under Government Regulation No. 22 of 2021 (PP 22/2021), with sector annexes issued through ministerial decrees. Illustrative BOD ranges of 30–100 mg/L and COD of 100–250 mg/L appear across common manufacturing sectors, while food, textile, and other high-risk streams face tighter annex values. Plants must hold Persetujuan Teknis (Technical Approval) before building or modifying treatment works, then obtain a Surat Layak Operasi (SLO) before any discharge. Domestic sanitary streams follow a separate rule set under PermenLH/BPLH No. 11/2025, not the industrial annexes.
What industrial effluent limits mean for Indonesian plants
Industrial effluent limits in Indonesia are sector-specific outlet caps for BOD, COD, TSS, nutrients, oil and grease, and priority metals before discharge to surface water. PP 22/2021 frames protection; Permen LHK No. 5/2014 and later annexes supply the numbers. Missed caps bring administrative sanctions and possible operational suspension.
Indonesia’s Industrial Wastewater Regulation Framework
Government Regulation No. 22 of 2021 (PP 22/2021) is the core legal frame for water-quality protection, with Articles 107–162 covering industrial effluent control. Facilities discharging to surface water, groundwater pathways, or other media must follow the sector standards issued under PP 22/2021 and later Ministerial Decrees. Those industrial annexes are distinct from domestic wastewater rules. According to the Ministry of Environment / BPLH (November 2025), PermenLH/BPLH No. 11/2025 sets domestic wastewater quality standards and treatment-technology expectations for residential, commercial, and municipal sanitary flows, not process wastewater.
Article 159 of PP 22/2021 prohibits discharge of wastewater into groundwater, natural springs, and closed lakes. Violations trigger immediate enforcement, including administrative sanctions and possible operational suspension. Before construction or major modification of a treatment system, every industrial wastewater generator must obtain Persetujuan Teknis. After commissioning, the plant must secure an SLO that confirms the system can meet the prescribed effluent quality before discharge begins. According to WEPA’s 2025 Indonesia briefing, Permen LHK No. 5/2021 details how Technical Approval and SLO are issued for pollution-control activities.
Key Industrial Effluent Parameters and Limits by Sector
Industrial effluent parameters in Indonesia use sector annexes sized to protect the receiving water body. Earlier illustrative guidance used textile BOD at 30 mg/L, pulp and paper at 50 mg/L, and metal processing at 100 mg/L. According to the WEPA 2025 Indonesia country presentation citing Permen LHK No. 5/2014 annex values still referenced in practice, textile BOD₅ is listed at ≤50 mg/L, COD ≤150 mg/L, and TSS ≤100 mg/L, with total chromium ≤0.1 mg/L. Food and beverage annex values are BOD₅ ≤30 mg/L, COD ≤100 mg/L, and TSS ≤50 mg/L. Palm-oil mill annex values commonly cited in the same briefing are BOD₅ ≤100 mg/L, COD ≤350 mg/L, TSS ≤250 mg/L, and oil and grease ≤25 mg/L.
COD limits also vary by sector; pharmaceutical manufacturing often requires COD below 100 mg/L in design briefs, while cement and general industrial examples in older tables may list up to 250 mg/L. TSS is generally capped between 50–100 mg/L depending on receiving-water Class I–IV under PP 22/2021, with Class I waters requiring the strictest protection. Ammonia is typically limited to 5–10 mg/L in sensitive watersheds, and phosphate to 1–3 mg/L where eutrophication risk is high. Surface-water industrial discharges keep pH between 6–9. KLH/BPLH also issued PermenLH/BPLH No. 12/2025 specifically for textile effluent quality, with a two-year transition for operators that already hold environmental approval (Ministry of Environment / BPLH, November 2025).
Table 1: Illustrative Industrial Effluent Parameter Limits by Sector in Indonesia (as of 2025)
| Parameter | Unit | Food & Beverage | Textile | Pulp & Paper | Pharmaceutical | Metal Processing | General Industrial (Example) | pH Range (All Sectors) |
|---|---|---|---|---|---|---|---|---|
| BOD5 | mg/L | 50 | 30 | 50 | 50 | 100 | 100 | 6.0 - 9.0 |
| COD | mg/L | 150 | 100 | 150 | 100 | 250 | 250 | |
| TSS | mg/L | 50 | 50 | 50 | 50 | 100 | 100 | |
| Ammonia (NH3-N) | mg/L | 10 | 5 | 10 | 5 | 10 | 10 | |
| Phosphate (PO4-P) | mg/L | 3 | 1 | 3 | 1 | 3 | 3 | |
| Oil & Grease | mg/L | 10 | 10 | - | - | 10 | 10 | |
| Total Chromium | mg/L | - | 0.1 | - | - | 0.1 | 0.5 |
Note: Table 1 remains illustrative planning values from earlier design briefs. Specific limits may vary based on Ministerial Decrees, local tightening, and receiving-water class. Consult the applicable sector annex and Permen 12/2025 for textiles before locking design guarantees.
How do EU wastewater discharge standards compare?
EU industrial discharge rules do not replace Indonesia’s PP 22/2021 framework or sector annexes for plants operating in Indonesia. Buyers comparing EU Best Available Techniques reference documents with Indonesian permits still size treatment to the Indonesian annex that matches their sector and receiving-water class. Cross-border EPC packages may use EU-style BAT narratives for technology selection, but compliance sampling, SPARING obligations, and SLO evidence remain Indonesian requirements.
How Domestic and Industrial Standards Differ in Practice
PermenLH/BPLH No. 11/2025 sets quality standards exclusively for domestic wastewater from residential areas, hospitality sites, and municipal sewage plants, not industrial process water. The regulation updates the domestic framework that previously relied on Permen LHK No. 68/2016 values such as BOD/COD/TSS around 30/100/30 mg/L for many hospitality and office discharges (WEPA, 2025). Industrial wastewater standards under PP 22/2021 address complex pollutant profiles from manufacturing. Domestic rules emphasize ammonia, phosphate, and microbiological indicators for public health; industrial annexes already cover those plus hazardous pollutants for high-risk sectors.
Many factories generate both process wastewater and domestic wastewater from worker housing, canteens, and restrooms. Those sites must meet the industrial annex limits on process streams and domestic standards on sanitary streams. Dual compliance closes a common blind spot when sanitary flows are mixed into an industrial WWTP without checking both rule sets.
What monitoring do Indonesian plants need?
Indonesian industrial plants follow a two-stage approval path before legal discharge. Persetujuan Teknis is mandatory before construction or modification of wastewater treatment infrastructure so the design matches regulatory requirements. An SLO must follow before discharge starts, confirming the operating plant meets effluent quality standards. Those approvals underpin the wastewater discharge authorization.
Ongoing compliance relies on reporting and monitoring. Facilities submit monthly reports on effluent quality and discharge volumes through the Sistem Informasi Lingkungan Hidup so the ministry can track performance. For facilities discharging more than 500 m³/day, continuous monitoring is mandated for critical parameters such as BOD, COD, TSS, and pH, often with automated instruments feeding compliance reports. WEPA (2025) also notes SPARING continuous online monitoring for designated high-risk sectors such as pulp and paper, textiles, palm oil, petrochemicals, and listed mining activities. Third-party accredited laboratories must test every three months for a broader pollutant set, including ammonia, heavy metals, and other priority pollutants. Missed monitoring or false reporting triggers administrative penalties and operational disruption.
Wastewater Treatment Technologies Matching Effluent Limits
Treatment trains must hit the annex values at the compliance point under the stated hydraulic and temperature conditions of the permit. For food processing and light manufacturing focused on organic load and solids, A/O (Anaerobic-Anoxic-Oxic) systems, SBR, and conventional activated sludge are common. Most plants we size for Indonesian food and light-industry duty run at the lower end of aeration demand when BOD must stay below 30 mg/L and TSS below 50 mg/L after secondary clarification. Packaged biological plants such as the WSZ Series Underground Integrated Sewage Treatment Plant are often used where footprint is tight and domestic-plus-light industrial loads share one train.
Palm oil, dairy, and meat plants with high fats, oils, and grease (FOG) usually need Dissolved Air Flotation ahead of biology. A high-efficiency DAF system for FOG and suspended solids removal can achieve 90–95% removal for those pollutants when polymer dose and recycle pressure are tuned to the measured FOG load, preparing water for biological polishing. The ZSQ Series Dissolved Air Flotation (DAF) Machine is a typical pretreatment block in that sequence.
Pharmaceutical, electronics, reuse, or sensitive-zone discharges often need Membrane Bioreactor (MBR) performance. MBRs deliver effluent with BOD typically below 10 mg/L and TSS below 5 mg/L under stable MLSS and membrane flux control, supporting non-potable reuse where permits allow. The MBR Integrated Wastewater Treatment System is selected when pathogen barriers and low TSS are permit drivers. Chemical coagulation and flocculation remain the practical path for phosphate targets of 1–3 mg/L and colloidal COD in textile dyeing. Metal finishing still relies on precipitation, ion exchange, or adsorption to hold chromium and related metals at 0.1–0.5 mg/L.
Selection checklist for Indonesian industrial WWTP upgrades
- Confirm the exact sector annex (and Permen 12/2025 textile transition status if applicable).
- Map process vs domestic streams and apply the correct standard to each.
- Size for peak hour and rainy-season dilution at the stated m³/d design flow.
- Decide whether SPARING / continuous analyzers are required for BOD, COD, TSS, and pH.
- Budget sludge handling, chemical dosing, and third-party lab fees every three months.
- Plan Persetujuan Teknis documents before civil works; reserve time for SLO commissioning tests.
- Stress-test FOG, color, and nutrient peaks that most plants miss on grab-sample averages.
Table 2: Wastewater Treatment Technologies and Their Alignment with Effluent Parameters
| Target Effluent Parameter | Typical Industrial Sectors | Recommended Treatment Technology | HydropureWater Product |
|---|---|---|---|
| BOD < 30 mg/L, TSS < 50 mg/L | Food Processing, Light Manufacturing, Domestic Sewage | Anaerobic-Anoxic-Oxic (A/O) Systems, SBR, Activated Sludge | WSZ Series Underground Integrated Sewage Treatment Plant |
| FOG > 90% removal, TSS > 90% removal | Palm Oil, Dairy, Meat Processing, Food & Beverage | Dissolved Air Flotation (DAF) Systems | ZSQ Series Dissolved Air Flotation (DAF) Machine |
| BOD < 10 mg/L, TSS < 5 mg/L, Pathogen Removal | Pharmaceuticals, Electronics, Water Reuse, Sensitive Discharge Zones | Membrane Bioreactor (MBR) Systems | MBR Integrated Wastewater Treatment System |
| Phosphate < 1-3 mg/L, Colloidal COD Reduction | Textile Dyeing, Chemical Manufacturing, Pulp & Paper | Chemical Coagulation/Flocculation + Sedimentation/Filtration | (Ancillary systems, e.g., chemical dosing units, clarifiers) |
| Heavy Metals < 0.1-0.5 mg/L | Metal Finishing, Mining, Battery Manufacturing | Chemical Precipitation, Ion Exchange, Adsorption | (Customized solutions) |
Who this is for / Next step
This guide is for environmental compliance officers, plant engineers, and EPC teams sizing or upgrading Indonesian industrial WWTPs against PP 22/2021 annexes. Teams that only need municipal domestic package plants under Permen 11/2025 without process wastewater should use domestic design guides instead. If you need a duty-based train matched to your sector annex and monitoring plan, share flow, COD/BOD peaks, and receiving-water class through our request-quote form for a scoped equipment proposal.
Frequently Asked Questions
What is the difference between PP 22/2021 and PermenLH/BPLH No. 11/2025?
PP 22/2021 is Indonesia’s overarching Government Regulation for environmental protection, covering water-quality management and industrial effluent control. PermenLH/BPLH No. 11/2025 is a ministerial regulation that sets domestic wastewater quality standards and treatment-technology expectations for sanitary flows. Industrial process discharges still follow PP 22/2021 plus the applicable sector annex, not Permen 11/2025 alone.
What BOD and COD limits apply to textile plants in Indonesia?
Earlier illustrative tables often listed textile BOD at 30 mg/L and COD at 100 mg/L. According to WEPA’s 2025 briefing citing Permen LHK No. 5/2014 annex practice, textile BOD₅ ≤50 mg/L, COD ≤150 mg/L, and TSS ≤100 mg/L with chromium ≤0.1 mg/L are the commonly referenced values, while Permen 12/2025 now updates textile rules with a two-year transition for existing approvals.
Do I need both Technical Approval and an SLO before discharging?
Yes. Persetujuan Teknis must be obtained before construction or significant modification of the wastewater treatment system. After commissioning proves the plant can meet the annex limits, an SLO (Operational Feasibility Certificate) is required before discharge begins. Skipping either step leaves the discharge unauthorized under Indonesia’s industrial compliance pathway.
When is continuous effluent monitoring required?
Facilities discharging more than 500 m³/day must continuously monitor critical parameters such as BOD, COD, TSS, and pH. Designated high-risk sectors also use SPARING continuous online systems under ministry rules summarized by WEPA (2025). All plants still file monthly quality and volume reports and run accredited third-party lab tests every three months for a wider pollutant set.
Which treatment technologies match common Indonesian annex targets?
A/O, SBR, or activated sludge trains are typical when BOD must stay below 30 mg/L and TSS below 50 mg/L for food and light industry. DAF is added for FOG-heavy palm oil, dairy, and meat streams targeting 90–95% FOG and TSS removal. MBR systems are used when BOD below 10 mg/L and TSS below 5 mg/L are required for reuse or sensitive receivers.
