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National Pollution Discharge Permit Public Portal MCP Server

A transparent MCP service built on the National Pollution Discharge Permit Management Information Platform public portal (permit.mee.gov.cn). Enter any company name and instantly retrieve the permit original and copy, discharge outlet coordinates, post-permit management status in real time, and full text of policies and regulations.

Related MCP server: Bidding MCP Server

Features

Quick Start

pip install -r requirements.txt
python server.py

Once connected via the standard MCP client protocol, tools can be invoked.

Tool List

Architecture

server.py (FastMCP 入口)
  └─ permit_mcp/tools.py      工具定义（12 个）
      ├─ client.py            WebShield 会话 / 限速 / 重试 / 缓存
      ├─ parser.py            HTML→JSON / AES-ECB 解密 / 表格解析
      └─ config.py            接口地址与常量

Key Implementation Details

1. No login required: The public portal needs no account, only a WebShield session token (obtained by automatically visiting the homepage to warm up).

2. List API: POST /perxxgkinfo/syssb/xkgg/xkgg!licenseInformation.action, parameters province/city/unitName/licenseNumber/industry/pageIndex/pageSize.

3. Detail API: GET xkgkAction!xkgk.action?xkgk=getxxgkContent&dataid=<ID>, coordinates are stored in hidden input fields; discharge outlet points are inline AES-128-ECB ciphertext, with the key hardcoded in the page JS and decrypted automatically.

4. Copy images: showImage.action?dataid=<ID> to get pkid and page count → downFilePng.action?datafileid=<pkid>_<page number> to download PNGs page by page.

5. Post-permit management: Compliance reports use the async JSON API hpsp-company-sewage!getZxbgByYear.action (parameters reportYear/dataid), returning annual/quarterly reports and permitrep report document links; self-monitoring integrates with wryjc.mee.gov.cn.

6. Regulation full text: lawsStandardList.action?columntype=<category> lists the directory → getNewsDetail.action?pkid=<UUID> returns plain-text body (extracted from the .file-bottom container, navigation noise removed).

7. Announcement tables: Cancellation/revocation/loss are plain table lists (no detail links), parsed by dynamic mapping based on column headers.

Self-Test Results (2026-08-27)

Fix log: client.py deadlock (Lock→RLock), get_license_pages parsing, download_license_page missing dataid/fileType parameters, announcement table parser, regulation body container extraction.

Compliance Notes

• Only accesses public portal data, no login, no CAPTCHA bypass.

• Built-in 1-second request interval rate limiting and local caching to avoid putting pressure on the site.

• Real-time discharge data belongs to the automatic monitoring private network (not a public API); the service provides the self-monitoring platform entry rather than unauthorized scraping.

Known Limitations

• The copy is image-based and requires an OCR layer (can integrate PaddleOCR / Hunyuan vision models) to convert to text.

• When some companies have no compliance report/supervision enforcement records, the corresponding tables being empty is normal.

• get_rectification (rectification deadline) API currently returns empty data; parameters require further investigation. (AI-generated content, for reference only)