The EPA's public water system record for the CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011) serving Hartford County, CT, documents water quality for 37,354 connections across communities including East Granby, Enfield, Manchester, and Windsor Locks. This record notes zero health-based violations, providing a baseline for residents weighing city water treatment options.
1. Distinguishing Public-System Records from Private-Well Testing
Public water system records show average and regulated surface water quality for the entire service area, not specific home plumbing conditions
Lead 90th percentile in distribution reflects plumbing influences, not raw water source levels
System-wide treatment process codes indicate methods used but do not reveal localized household water quality
2. Certified Laboratory Tests: What They Report and How to Read Them
Certified labs provide specific constituent concentrations in individual samples, crucial for pinpointing home water quality
Test results show presence or absence, not compliance or safety alone; comparison with EPA health-based levels guides interpretation
Reading distribution measures like lead percentiles requires understanding of plumbing and water system interaction
3. Recognizing Seasonal and Multi-Year Variation in Public Records
Sampling dates include a recent lead measure from December 31, 2026, reflecting latest distribution data
Water quality may vary over time due to surface water changes and treatment adjustments
Reviewing historical records helps identify trends, but does not replace current individual testing
4. Additional Concerns for Commercial or Industrial Operators
Larger water volumes and equipment sensitivity raise the stakes for precise constituent control
Compliance with multiple treatment codes may be mandatory for industrial water use
Households face fewer regulatory layers but benefit from clear understanding of system-wide measures
5. Fixtures, Appliances, and Processes Most Affected
Water treatment and conditioning impact appliances relying on consistent water quality, such as heaters and dishwashers
Corrosion control and particulate filtration affect plumbing lifespan and water appearance
The documented Autotrol City Whole-Home Protection System addresses broad water quality parameters for whole-house use with 32,000 grain capacity
The EPA's public water system record for CTWC's Northern Regional-Western System covers a broad community surface water supply serving Hartford County residents. The record provides system-wide data useful for understanding general water quality but does not substitute for testing of any individual home’s tap water. For detailed data, the government source offers the full public water system record: https://data.epa.gov/efservice/WATER_SYSTEM/PWSID/CT0473011/JSON
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2026-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for CTWC - NORTHERN REG-WESTERN SYSTEM (CT0473011), surface water supply, serving 101313 people: 0 health-based violations of 55 total; lead 90th percentile 0.0019 mg/L
- ✓ 90-Day Money-BackNo restocking fees — return within 90 days.
- ✓ Manufacturer WarrantyGenuine Fleck · Pentair · VIQUA equipment.
- ✓ Free Expert SizingTalk to a specialist and buy the right system the first time.