Photo: Kenneth C. Zirkel · CC BY-SA 4.0Living in Danielson, CT: what to set up and who to call
All of Danielson gets its mail under one ZIP code, 06239. Danielson has its own library, Killingly Public Library, at 25 Westcott Rd.
I’m new in town
What to set up in Danielson, and who provides it. Tap an answer for the details and where they come from.
Power, water and internet
Who to call to start service at a new address in Danielson.
Power comes from Eversource
Eversource (Connecticut Light & Power Co.), an investor-owned utility, serves all of Danielson. Its homes paid an average of 28.9¢ per kWh in 2025, about $195 a month (its average across Connecticut, for customers on its standard service). Connecticut lets you buy power from another supplier; 17% of Eversource’s home customers do, and Eversource still delivers it.
Start or move service: cl-p.com · (800) 286-2000
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Ctwc - Crystal System
Ctwc - Crystal System supplies almost all of Danielson. It draws ground water (EPA lists Putnam Water Pollution Control Authority as seller) and serves 6,378 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 80% of the 5,012 systems serving 3,301–10,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan–Dec 2026, was 2.1 ppb, below the 15 ppb action level that applied. The highest in five years was 2.2 ppb. That’s higher than 72% of similar systems’ latest results.
The system’s full record: EPA ECHO report
EPA SDWIS via Envirofacts (violations pulled Oct 9, 2026) and ECHO (lead samples, 2026Q3); service area: EPA Community Water System Service Area Boundaries v3.0. Violations are counted by the start of their compliance period. CT0690011.
5 home internet providers serve Danielson
100% of 1,145 addresses can get 100/20 Mbps; 73% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 99% | 2,000/250 |
| Breezeline | Cable | 95% | 1,000/50 |
| Frontier | Fiber, DSL | 75% | 7,000/7,000 |
| AT&T | Fixed wireless | 65% | 25/3 |
| Verizon | Fixed wireless | 54% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Danielson’s trash rules yet
Pickup rules, the dump and recycling in Danielson.
Where your child goes to school
Public school districts and the school path by grade.
Danielson is in Killingly School District.
C−School gradeSee Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Jun 2019; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 30, 2026.
Danielson is in ZIP code 06239
ZIP codes where Danielson residents live, with the share of the town in each.
| ZIP | Post office name | Share of Danielson | ZIP’s residents in Danielson |
|---|---|---|---|
| 06239 | Danielson, CT | 100% | 36% |
Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.
Getting around, the ER and the library
One line each; the subject pages have the rest.
ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Danielson
Who supplies Danielson’s drinking water, and has it had violations?
Ctwc - Crystal System (EPA ID CT0690011). It reported no health-based violations to EPA in the five years to October 2026; 80% of systems its size had none. Its latest lead 90th percentile was 2.1 ppb (Jan–Dec 2026), against a 15 ppb action level.
Who provides electricity in Danielson?
Eversource (Connecticut Light & Power Co.), an investor-owned utility. Its homes paid about 28.9¢ per kWh in 2025 (EIA).
What internet providers serve Danielson?
Xfinity, Breezeline, Frontier, AT&T, Verizon (FCC, as of December 2025).
What ZIP codes are in Danielson?
06239. Census 2020 ZIP Code Tabulation Areas.
What school district is Danielson in?
Killingly School District.
How do I register to vote in Danielson?
In Connecticut you can register online until 18 days before Election Day, in person up to and including Election Day, or by mail (postmarked 18 days before). Elections here are run by the Killingly Town Clerk. Check your registration at portaldir.ct.gov.
Sources & dates
Every answer above names its source. Here they are with their dates.
- Water: EPA SDWIS (Envirofacts, pulled Oct 9, 2026), ECHO SDWA 2026Q3, EPA CWS Service Area Boundaries v3.0.
- Power: HIFLD Electric Retail Service Territories (map Aug 2023); EIA-861 final 2025.
- Trash: OpenStreetMap, Geofabrik extract of Oct 9, 2026. © OpenStreetMap contributors (ODbL).
- ZIP codes: Census 2020 ZCTA relationship files; GeoNames postal codes (CC BY 4.0).
- Schools: NCES Common Core of Data, 2024–25.
- Registration: vote.gov, updated Sep 30, 2026 (read Oct 10, 2026). Official sites and area codes: Wikidata.
- Election office: FVAP local election office directory (fetched Oct 10, 2026; each record dated), EAC EAVS 2024 jurisdictions; registration and lookup links from vote.gov’s state data, checked Oct 10, 2026.
- Internet: FCC National Broadband Map, as of December 2025.