Regulatory Compliance Guide

Sindh Environmental Quality Standards (SEQS): Limits, Parameters and Compliance

SEQS stands for the Sindh Environmental Quality Standards - the legally binding limits, notified under the Sindh Environmental Protection Act 2014, that govern what industries and facilities in Sindh may discharge to water, emit to air, and generate as noise. This guide explains what the standards require, presents the key limit values, and shows how facilities demonstrate compliance to the Sindh Environmental Protection Agency (SEPA).

Last reviewed: June 2026

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What is SEQS

What SEQS means - and why it binds your facility

The Sindh Environmental Quality Standards 2016 were notified after the 18th Constitutional Amendment devolved environmental regulation to the provinces. They adapt the former National Environmental Quality Standards (NEQS) framework for Sindh and are enforced by SEPA through licensing conditions, Environmental Management Plan (EMP) approvals, and periodic Environmental Monitoring Reports (EMRs). If your facility holds - or needs - a SEPA approval, SEQS limits are the numbers your monitoring results are judged against. Exceeding them exposes the facility to penalties under the Sindh Environmental Protection Act 2014 and jeopardises NOC renewals.

environmental consultancy for SEPA compliance

Who must comply

Who must comply

SEQS obligations apply across textile and garment units, leather and tanneries, food and beverage plants, pharmaceutical manufacturers, chemical and cement works, oil and gas operations, hospitals, hotels, construction projects and commercial facilities - in practice, any operation in Sindh that discharges effluent, runs generators or boilers, emits to air, or operates under an EMP/EMR condition. Punjab facilities operate under the parallel Punjab Environmental Quality Standards (PEQS) enforced by the Punjab EPA; Envi Tech AL holds approvals from both agencies.

Effluent limits table

SEQS liquid effluent limits - key parameters

The table below presents the most frequently tested parameters from the SEQS 2016 liquid effluent standards. Limits vary by discharge destination: inland waters, sewage treatment, or the sea. All values in mg/L unless stated.

SEQS liquid effluent limits by discharge destination
ParameterInto inland watersInto sewage treatmentInto the sea
pH (range)6-96-96-9
Temperature increase<=3 deg C<=3 deg C<=3 deg C
BOD58025080
COD150400400
Total suspended solids200400200
Total dissolved solids3,5003,5003,500
Oil & grease101010
Phenolic compounds0.10.30.3
Sulphide (S2-)1.01.01.0
Ammonia (NH3)404040
Cadmium0.10.10.1
Chromium (total)1.01.01.0
Copper1.01.01.0
Lead0.50.50.5
Mercury0.010.010.01
Nickel1.01.01.0
Zinc5.05.05.0
Arsenic1.01.01.0

This table is a working summary for orientation. The authoritative text, including all parameters, annexes and notes, is the official notification - download the complete SEQS 2016 document below. For ambient air quality, stack emissions, motor vehicle exhaust, noise and drinking water, SEQS notifies separate annexes; the full document contains every table.

Beyond effluent

Air, noise and drinking water standards under SEQS

Ambient air quality: limits for SO2, NOx, particulate matter (PM10 and PM2.5), CO, ozone and lead, measured at facility boundaries and sensitive receptors. Stack and gaseous emissions: source-specific limits for boilers, generators and process stacks. Noise: day and night limits by zone - residential, commercial, industrial and silence zones. Drinking water: quality parameters aligned with WHO guideline values. Envi Tech AL's field monitoring and laboratory teams test against every one of these annexes.

ambient air monitoring water testing laboratory wastewater testing

How compliance works

How facilities demonstrate SEQS compliance

  1. Step 1 - Know your conditions. Your EMP approval or NOC specifies which SEQS annexes apply, which points are sampled, and how often.
  2. Step 2 - Monitor and test. Samples and field measurements are taken at the specified frequency and analysed by an accredited laboratory against the applicable limits.
  3. Step 3 - Report. Results are compiled into the Environmental Monitoring Report (EMR) submitted to SEPA, stating compliance status parameter by parameter.
  4. Step 4 - Act on exceedances. Where a result exceeds a limit, SEPA expects corrective action - process adjustment, treatment plant optimisation or retesting - documented in the next submission. Envi Tech AL supports all four steps as one workflow: accredited testing, field monitoring, EMR preparation and corrective-action advisory.

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Get the full official notification - every annex, every parameter, every note. The existing PDF remains directly accessible at its original URL.

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Frequently asked questions

SEQS answers for compliance teams

What does SEQS stand for?

SEQS stands for Sindh Environmental Quality Standards - the province's legally enforceable limits for effluent discharge, air emissions, ambient air quality, noise and drinking water, notified under the Sindh Environmental Protection Act 2014 and enforced by SEPA.

What is the difference between SEQS, NEQS and PEQS?

NEQS are the original national standards. After environmental regulation devolved to the provinces, Sindh notified SEQS (2016) and Punjab notified PEQS - each provincially enforceable. A facility in Karachi answers to SEQS and SEPA; a facility in Lahore answers to PEQS and the Punjab EPA. The frameworks are closely aligned but not identical, so always test against the standard your approval cites.

What are the SEQS limits for wastewater discharge?

Key effluent limits include pH 6-9, BOD5 of 80 mg/L into inland waters (250 mg/L into sewage treatment), COD of 150 mg/L into inland waters, oil and grease of 10 mg/L, and parameter-specific limits for heavy metals such as lead (0.5 mg/L), cadmium (0.1 mg/L) and mercury (0.01 mg/L). The full tables, including discharge-destination variations, are in the complete document above.

Where can I download the SEQS 2016 PDF?

The complete official SEQS 2016 notification is available from this page - see the download section above.

How do I test my facility's effluent against SEQS?

Sampling must follow correct preservation and chain-of-custody practice, and analysis must be performed by a laboratory SEPA will accept - accredited methods, calibrated instruments and verifiable reporting. Envi Tech AL is an ISO/IEC 17025:2017 accredited, Sindh EPA certified laboratory; send your discharge type and approval conditions and the team will quote the exact SEQS panel your facility needs.

Testing against SEQS limits, reported the way SEPA expects

From a single effluent sample to a complete EMR programme - one accredited team for sampling, analysis, monitoring and submission-ready reporting.

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