ITIS vs USGS Water Services
Same instrument, two spec sheets — measured, not claimed.
ITIS vs USGS Water Services: common questions
Which is more reliable, ITIS or USGS Water Services?
On our scheduled checks, ITIS leads on measured uptime — ITIS at 97.1% versus USGS Water Services at 87.3% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, ITIS or USGS Water Services?
USGS Water Services has the lower median latency in our checks — ITIS responds in 1767 ms versus USGS Water Services at 828 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do ITIS and USGS Water Services need an API key?
Neither needs a paid key — ITIS is callable with no signup, and USGS Water Services is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call ITIS and USGS Water Services from the browser?
Only USGS Water Services is browser-friendly — it returns CORS headers over HTTPS. ITIS needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are ITIS and USGS Water Services free for commercial use?
ITIS has unclear commercial terms, and USGS Water Services allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.