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1,008 Idaho water systems have inventoried 610,297 service lines for EPA. 633 (0.1%) are confirmed lead and 96,675 (16%) are still of unknown material. Below: every large or city-linked Idaho utility ranked by lead lines.
Idaho water systems reported 633 lead service lines and 2,136 galvanized lines requiring replacement as of Q2 2026 — 0.1% of the 610,297 lines inventoried and <0.1% of the national lead total, ranking #34 of 51. CALDWELL CITY OF reports the most in the state (50).
CALDWELL CITY OF (50).
Find your utility in the table below, then check its published service line inventory (most utilities post an address-lookup map) or call the number on your water bill. Utilities must notify customers whose line is lead, galvanized-requiring-replacement or unknown. You can also test the pipe entering your home: lead is soft, dull gray, non-magnetic and turns shiny when scratched.
Under EPA's Lead and Copper Rule Improvements, systems must replace lead and galvanized-requiring-replacement lines within 10 years starting in 2027; systems with very high counts can receive longer deadlines. Ask your utility for its replacement plan and whether it covers the homeowner-owned portion.
Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking, flush the tap after water has sat for hours, never use hot tap water for drinking or infant formula, and confirm your actual level with a certified lab test.
Source: EPA SDWIS Service Line Inventory, Q2 2026 snapshot (updated 2026-08-18). Counts are service lines, not people.
A certified mail-in lab test shows exactly what's in your water — lead plus dozens of other contaminants — with EPA-grade accuracy. Know your real levels before spending on a filter.
Certified lab · results in days
Community systems serving 50,000+ people plus systems linked to a city report on this site (20 shown). State totals above include every reporting system.
| # | Water system | Status | Lead | GRR | Unknown | Total lines | City report |
|---|---|---|---|---|---|---|---|
| 1 | CALDWELL CITY OF ID3140013 · 74,000 served | Lead service lines present | 50 | 1 | 246 | 21,976 | Caldwell → |
| 2 | VEOLIA WATER IDAHO ID4010016 · 264,978 served | Many lines still unverified | 0 | 0 | 51,992 | 110,534 | Boise → |
| 3 | NAMPA CITY OF ID3140080 · 100,200 served | No lead service lines reported | 0 | 0 | 9,492 | 38,360 | Nampa → |
| 4 | BLACKFOOT CITY OF ID6060007 · 13,224 served | Many lines still unverified | 0 | 0 | 3,068 | 4,487 | Blackfoot → |
| 5 | JEROME CITY OF ID5270011 · 13,135 served | Many lines still unverified | 0 | 0 | 2,409 | 4,630 | Jerome → |
| 6 | CHUBBUCK CITY OF ID6030008 · 15,842 served | Many lines still unverified | 0 | 0 | 2,130 | 4,991 | |
| 7 | GARDEN CITY WATER AND SEWER SYSTEM ID4010066 · 12,500 served | No lead service lines reported | 0 | 0 | 904 | 5,012 | Garden City → |
| 8 | MOSCOW WATER DEPT ID2290023 · 26,000 served | No lead service lines reported | 0 | 0 | 253 | 5,870 | Moscow → |
| 9 | COEUR D ALENE CITY OF ID1280053 · 54,115 served | No lead service lines reported | 0 | 0 | 62 | 20,894 | |
| 10 | MERIDIAN WATER DEPT ID4010097 · 147,340 served | No lead service lines reported | 0 | 0 | 0 | 47,953 | Meridian → |
| 11 | IDAHO FALLS CITY OF ID7100039 · 69,450 served | No lead service lines reported | 0 | 0 | 0 | 49,218 | |
| 12 | POCATELLO CITY OF ID6030043 · 58,231 served | No lead service lines reported | 0 | 0 | 0 | 21,030 | |
| 13 | TWIN FALLS CITY OF ID5420058 · 56,121 served | No lead service lines reported | 0 | 0 | 0 | 19,273 | Twin Falls → |
| 14 | REXBURG CITY OF ID7330022 · 40,695 served | No lead service lines reported | 0 | 0 | 0 | 3,702 | |
| 15 | KUNA CITY OF ID4010085 · 32,038 served | No lead service lines reported | 0 | 0 | 0 | 11,363 | Kuna → |
| 16 | POST FALLS CITY OF ID1280147 · 20,285 served | No lead service lines reported | 0 | 0 | 0 | 8,114 | Post Falls → |
| 17 | LEWISTON ORCHARDS IRRIGATION DIST ID2350015 · 20,000 served | No lead service lines reported | 0 | 0 | 0 | 7,610 | Lewiston → |
| 18 | AMMON CITY OF ID7100004 · 17,338 served | No lead service lines reported | 0 | 0 | 0 | 6,487 | Ammon → |
| 19 | MOUNTAIN HOME, CITY OF ID4200032 · 14,651 served | No lead service lines reported | 0 | 0 | 0 | 5,842 | |
| 20 | EAGLE, CITY OF (WESTERN ZONE) ID4010222 · 6,108 served | No lead service lines reported | 0 | 0 | 0 | 2,665 | Eagle → |
A lead or unknown service line means lead can enter water after it leaves the treatment plant, so city-level test results understate what reaches your tap. Filter drinking and cooking water with an NSF/ANSI 53 lead-certified system, and see the lead in drinking water guide or Idaho city water reports.
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