A prohibited connection is any direct or indirect connection to the storm drainage system that results in a water quality violation. This includes connections from roof drains, water softeners, kitchen drains, bathroom drains, dishwashers and chlorinated pool water that could result in a violation of water quality standards.

Specifics are covered in the Pinellas County Code of Ordinances, Article VI, Stormwater and Surface Water Pollution, Section 58.

• Sec. 58-237. - Intent.  This article is adopted by the county for the purpose of maintaining efficient, economic and safe operation of the separate storm sewer system, and for the protection of the health, safety, and general welfare of the public within unincorporated county. This article is intended to prevent and abate pollution through the regulation and control of connections and discharges to the separate storm sewer system or receiving waters of the county and to limit the use of the separate storm sewer system to the collection, conveyance, treatment, and disposal of stormwater through appropriate regulation and enforcement. The prohibitive discharge standards contained in this article were developed under the authority of section 5 of the act and 40 CFR 122, applicable FDEP, SWFWMD regulations and applicable home rule power.
  (Ord. No. 06-13, § 1, 2-7-06)
• Sec. 58-238. - Penalty for violation of article.Failure to comply with the requirements of this article or any permit or approval granted or authorized under this article shall be punished as provided in section 1-8.
  (Ord. No. 06-13, § 1, 2-7-06)
• Sec. 58-239. - Civil remedies (a) Abatement. In addition to the penalties provided in section 58-238 the board of county commissioners is hereby authorized to institute any appropriate action or proceeding, including suit for injunctive relief, in order to prevent, clean-up, or abate violations of this article. (b) Additional penalties. The board of county commissioners is also authorized in accordance with the Pinellas County Environmental Enforcement Act (compiled in article II of this chapter) to impose and recover a civil penalty for each violation of this article in an amount not more than $10,000.00 for each offense. If a violation of this article is continued, each day of such violation shall constitute a separate offense.
• Sec. 58-244. - Prohibited discharges. (a) General prohibitions. Except as set forth under subsection (c) of this section or in accordance with a valid NPDES permit, any discharge to the separate storm sewer system or to any receiving waters of the county that is not composed entirely of storm water is prohibited. (b)Specific prohibitions. In addition to the general prohibitions set forth in subsection (a) of this section, any discharge to the separate storm sewer system or to any receiving waters of the county containing any chemicals, petroleum products, automotive fluids of any kind, sewage, industrial waste, sediment, construction or building materials, yard waste or other waste materials, or containing any materials in violation of federal, State, county, municipal, or other laws, rules, regulations, orders or permits, or which causes or contributes to a violation of State water quality standards contained in Chapter 62, Florida Administrative Code, in the waters of the United States, is prohibited.
  

• Before draining your pool, allow the water to stand for at least 48 hours to dissipate chlorine levels to 0.01 mg/L or less.
• Be aware of any additional chemicals that you may have added, and adhere to the 48-hour stand time before discharging.
• Be sure that the pH of the water discharging is between 6.5 and 8.5 and that the water is clear and free of solids.
• Direct the discharge over a vegetated surface so that some level of filtration can occur. The County recommends a 12-foot vegetated buffer between the end of the pipe and County right-of-way.
• Do not discharge over an area that was recently treated with herbicides or pesticides.