County · Connecticut
New London County, Connecticut: drinking water records
Explore EPA records for 88 community water systems across 33 ZIP codes in New London County, then find water-testing resources and available recent monitoring-station readings.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
Drinking-water records
EPA survey and compliance records are historical reports. UCMR 5 results are available for 8 of the 88 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems in this county
All 88 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Norwich Public Utilities CT1040011 | 36,163 | 300 | 5 | 6 | 0 ppbbelow the action level |
| Jewett City Water Company CT0580011 | 6,840 | 180 | 1 | 1 | 0 ppbbelow the action level |
| Groton Utilities CT0590011 | 30,200 | 120 | 0 | 0 | 0 ppbbelow the action level |
| New London Dept. of Public Utilities CT0950011 | 27,620 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Waterford Wpca CT1520071 | 16,578 | 120 | 0 | 0 | 1.5 ppbbelow the action level |
| East Lyme Water & Sewer Commission CT0450011 | 15,245 | 420 | 6 | 0 | 0 ppbbelow the action level |
| Aquarion-Mystic CT1370011 | 10,788 | 180 | 1 | 0 | 3 ppbbelow the action level |
| Colchester Sewer & Water Commission CT0280011 | 4,020 | 240 | 2 | 0 | 0 ppbbelow the action level |
| Ledyard Wpca - Ledyard Center CT0727091 | 3,294 | 0 | 0 | 3 | 0 ppbbelow the action level |
| Scwa, Tower-Ferry View Division CT0720041 | 2,567 | 0 | 0 | 1 | 3.3 ppbbelow the action level |
| Scwa, North Stonington Division (Nst) CT1020021 | 1,860 | 0 | 0 | 1 | 1.9 ppbbelow the action level |
| Scwa, Oakdale Heights Division CT0860031 | 876 | 0 | 0 | 1 | 7.6 ppbbelow the action level |
| Preston Plains Water Company CT1140011 | 550 | 0 | 0 | 1 | 5.3 ppbbelow the action level |
| Scwa, Cedar Ridge Division CT1020011 | 370 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Chadwick Homeowners Assn., INC. CT1050011 | 292 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Colchester Estates CT0280041 | 276 | 0 | 0 | 1 | 0 ppbbelow the action level |
| St. Thomas More School-Main System CT0861251 | 270 | 0 | 0 | 1 | 1.1 ppbbelow the action level |
| Westchester Hills Condominium Assn. CT0280031 | 225 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Colchester Commons CT0286011 | 224 | 0 | 0 | 2 | 0 ppbbelow the action level |
| Carefree Homeowners Association CT0710011 | 172 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Mountview Apartments CT0861051 | 105 | 0 | 0 | 7 | 0 ppbbelow the action level |
| Griswold MHP LLC CT0580031 | 99 | 0 | 0 | 1 | 0.6 ppbbelow the action level |
| Deer Run Supply CT0860051 | 84 | 0 | 0 | 1 | 1.3 ppbbelow the action level |
| Lincoln Park Elderly Housing CT1140021 | 80 | 0 | 0 | 1 | 0.6 ppbbelow the action level |
| Northstone Gardens CT1021001 | 79 | 0 | 0 | 4 | 2.3 ppbbelow the action level |
| Thompson Hill Water Co - Beechwood Acres CT0867071 | 77 | 0 | 0 | 2 | 0.7 ppbbelow the action level |
| Ashland Pond Mobile Home Park CT0580061 | 74 | 0 | 0 | 1 | 2 ppbbelow the action level |
| Lakeside Manor Apartments CT0860091 | 72 | 0 | 0 | 2 | 1.3 ppbbelow the action level |
| Round Hill LLC - Well# 1&2 CT0731021 | 72 | 0 | 0 | 1 | 2.8 ppbbelow the action level |
| Marina Cove CT0860141 | 70 | 0 | 0 | 2 | 2.9 ppbbelow the action level |
| Oakridge Gardens, LLC CT0860171 | 70 | 0 | 0 | 1 | 0.7 ppbbelow the action level |
| Ctwc - Lebanon Elderly Div. CT0711071 | 67 | 0 | 0 | 1 | 1.3 ppbbelow the action level |
| Mile Creek Apartments CT1050131 | 60 | 0 | 0 | 1 | 2.8 ppbbelow the action level |
| Neighbors of Rogers, LLC CT0597021 | 57 | 0 | 0 | 1 | 2.4 ppbbelow the action level |
| Independence Village Elderly Housing CT0860191 | 55 | 0 | 0 | 1 | 7.3 ppbbelow the action level |
| Lymewood Elderly Housing CT1056221 | 50 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Lyme Academy Apartments,llc CT1059251 | 48 | 0 | 0 | 4 | 0 ppbbelow the action level |
| Laurel Heights Association, INC. CT1056231 | 45 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Freedom Village Elderly Housing CT0866301 | 43 | 0 | 0 | 4 | 5.2 ppbbelow the action level |
| Voluntown Housing Authority CT1479021 | 42 | 0 | 0 | 3 | 4.5 ppbbelow the action level |
| Fox Laurel Mobile Home Park, LLC CT0861111 | 40 | 0 | 0 | 3 | 2.3 ppbbelow the action level |
| Village Hill Apartments CT0711001 | 36 | 0 | 0 | 1 | 0.6 ppbbelow the action level |
| Salem Manor Condominiums, System #1 CT1210011 | 32 | 0 | 0 | 2 | 0 ppbbelow the action level |
| Boxwood Condominium Association CT1051011 | 28 | 0 | 0 | 2 | 1.8 ppbbelow the action level |
| Salem Manor Condominiums, System #2 CT1219111 | 25 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Ctwc - Shoreline Region-Sound View CT1050732 | 3,397 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Scwa, Montville Division (Mtv) CT0860011 | 2,570 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Groton Long Point Association CT0590051 | 2,400 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ledyard Wpca, Gales Ferry System CT0727051 | 2,369 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Noank Fire District CT0590031 | 1,947 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Scwa, Mohegan Division CT0860021 | 1,428 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Montville Water Supply CT0864011 | 1,300 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ctwc - Shoreline Region-Point O Woods CT1050752 | 1,068 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sprague Water & Sewer Authority CT1330021 | 1,058 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Scwa, Ledyard Center Division CT0720313 | 652 | 0 | 0 | 0 | 2.2 ppbbelow the action level |
| Scwa, Chesterfield Division CT0860081 | 524 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kitemaug Orchard Association, INC. CT0860041 | 490 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Scwa, Hillcrest Division (Hlc) CT0860131 | 450 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Ctwc - Shoreline Region-Masons Island CT1370051 | 445 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ctwc - Bay Mountain CT0580041 | 440 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Aquarion-Arlington Acres CT1370071 | 392 | 0 | 0 | 0 | 1.9 ppbbelow the action level |
| Scwa, Robin Hill Division (Rbn) CT0867101 | 388 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Aquarion-Pleasure Valley CT1041001 | 328 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Jewett City Water Co., S & W System CT0580051 | 320 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sunny Waters Mobile Home Park CT1040091 | 303 | 0 | 0 | 0 | 2.2 ppbbelow the action level |
| Meadows Apartments CT0861021 | 301 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Scwa, Barrett Division (Bar) CT0720011 | 300 | 0 | 0 | 0 | 13.6 ppbbelow the action level |
| Ctwc - Westchester Village CT0282001 | 252 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ctwc - Sdc Water CT1470011 | 216 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Ctwc - Country Mobile Div. CT0580021 | 186 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Crystal Lake Condominiums CT1210021 | 184 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Waterford Country School, INC. CT1520061 | 180 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Scwa, Chriswood Division (Cwd) CT0727031 | 164 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lisbon Mobile Homes CT0730031 | 155 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Aquarion-Lebanon CT0710021 | 149 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Jewett City Water Co-Hill-N-Dale CT0730021 | 146 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ash Water Company, LLC CT0720101 | 108 | 0 | 0 | 0 | 3.5 ppbbelow the action level |
| Scwa, Birchwood Division (Bwd) CT0869011 | 108 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Green Village II CT1219141 | 96 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Knob Hill Condominiums CT0280051 | 84 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rye Field Manor Elderly Housing CT1056241 | 78 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Mystic Village Apartments CT0590071 | 66 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Ctwc - Ponemah Village CT0280071 | 60 | 0 | 0 | 0 | 4.7 ppbbelow the action level |
| Tunnel Hill Mobile Home Park CT0731011 | 40 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Oakridge Village CT0860211 | 33 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lyme Regis, INC. CT1050141 | 32 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Scwa, Seven Oaks (Oak) CT0869121 | 26 | 0 | 0 | 0 | 0 ppbbelow the action level |
| St. Thomas More School-The Cove CT0868011 | 25 | 0 | 0 | 0 | 0 ppbbelow the action level |
USGS · Monitoring stations
The water, more recently.
Available station readings in New London County, Connecticut. Each measurement keeps its time, unit and original source.
These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.
Recent observations load when this section comes into view.
How these readings update
We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.
Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.
Your next step
Water testing, reports & local help.
Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.
Official national directories
Water testing
Find your state’s private-well program
EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.
Water testing
Find a certified drinking-water laboratory
Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.
Public records
Find your utility’s Consumer Confidence Report
EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.
Public records
Explore USGS water observations
Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.
A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.
Understand water testing and laboratory reportsResource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction
Explore your area
Local coverage in New London County
33ZIP areas in this overview
Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.
Towns and communities
- Baltic
- Colchester
- Conning Towers-Nautilus Park
- Gales Ferry
- Jewett City
- Mashantucket
- New London
- Niantic
- Norwich
- Old Mystic
- Oxoboxo River
- Pawcatuck
- Stonington
- Waterford
View ZIP areas and understand coverage
- 06249
- 06254
- 06320New London
- 06330Baltic
- 06333
- 06334
- 06335Gales Ferry
- 06336
- 06338Mashantucket
- 06339Mashantucket
- 06340Conning Towers-Nautilus Park
- 06350
- 06351Jewett City
- 06353Oxoboxo River
- 06355Old Mystic
- 06357Niantic
- 06359
- 06360Norwich
- 06365Mashantucket
- 06370Oxoboxo River
- 06371
- 06375
- 06376
- 06378Stonington
- 06379Pawcatuck
- 06380Norwich
- 06382Oxoboxo River
- 06384
- 06385Waterford
- 06389Norwich
- 06415Colchester
- 06420
- 06439
These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.
Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.
Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.